JavaWab开发基础片（一）

转载于：（https://blog.csdn.net/qq_31242531/article/details/80497940）
内容详见上文，谢谢！

最近在测试中发现mysql数据库保存测试用例，测试结果是一种不错的选择，为了后期方便在客户端展示测试，便写了个接口。此次接口开发不使用任何框架，需下载gson.jar，mysql-connector.jar，servlet-api.jar，以下为接口的开发思路

1.创建数据表，我这边使用的是mysql数据库

     
     
/*
SQLyog 企业版 - MySQL GUI v8.14
MySQL - 5.5.49 : Database - test
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/ `test` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `test`;

/*Table structure for table `testcase` */

DROP TABLE IF EXISTS `testcase`;

CREATE TABLE `testcase` (
`caseId` INT( 11) NOT NULL AUTO_INCREMENT,
`caseName` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
`caseDetail` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
`caseDevice` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
PRIMARY KEY ( `caseId`)
) ENGINE= INNODB AUTO_INCREMENT= 48 DEFAULT CHARSET=utf8 CHECKSUM= 1 DELAY_KEY_WRITE= 1 ROW_FORMAT=DYNAMIC;

/*Data for the table `testcase` */

INSERT INTO `testcase`( `caseId`, `caseName`, `caseDetail`, `caseDevice`) VALUES ( 2, '2', '233', '444'),( 16, 'dsf', 'sf', 'sfd'),( 17, 'safd', 'sadf', 'asf'),( 18, 'saf', 'ggd', 'sdf'),( 19, 'dsaf', 'sdf', 'sdf'),( 20, 'sfd', 'sfd', '(NfdsULL)'),( 21, 'sdf', 'v', 'v'),( 22, 'f', 'f', 'e'),( 23, 'w', 'r3', 'rt'),( 24, 'er', 'rtrt', 'sfad'),( 25, 'sf', 'sdf', 'fds'),( 26, 'sa', 's', 's'),( 27, 'e', 'e', 'e'),( 28, 'sa', 'rt', 'rt'),( 29, 'we', 'ew', 'qw'),( 30, 'we', '(NULfL)', 'dsf'),( 31, 'fd', 's', 'g'),( 32, 's', 'g', 'f'),( 33, 'sf', 'f', 'f'),( 34, 'c', 'c', 'c'),( 35, 'e', 'e', 'e'),( 36, 'd', 'd', 'q'),( 37, 'q', 'e', 'r'),( 38, 'f', 'r', 'g'),( 39, 'g', '(NULgL)', 'g'),( 40, 'gg', 'g', 'd'),( 41, 'f', 'f', 'f'),( 42, 'f', 'f', 'f'),( 43, 'f', 'f', 'f'),( 44, 'v', 'f', 'g'),( 45, 'e', 'e', 'r'),( 46, '4', 'rt', 'fg'),( 47, 'dsf', 'ds', 'sdf');

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
     
     

2.编写数据库工具类

     
     
package model;

import java.sql.*;

public class DBconn {
static String url = "jdbc:mysql://localhost:3306/test?useunicuee=true& characterEncoding=utf8";
static String username = "root";
static String password = "123456";
static Connection conn = null;
static ResultSet rs = null;
static PreparedStatement ps = null;
public static void init(){
try {
Class.forName( "com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url,username,password);
} catch (Exception e) {
System.out.println( "init [SQL驱动程序初始化失败！]");
e.printStackTrace();
}
}
public static int addUpdDel(String sql){
int i = 0;
try {
PreparedStatement ps = conn.prepareStatement(sql);
i = ps.executeUpdate();
} catch (SQLException e) {
System.out.println( "sql数据库增删改异常");
e.printStackTrace();
}

return i;
}
public static ResultSet selectSql(String sql){
try {
ps = conn.prepareStatement(sql);
rs = ps.executeQuery(sql);
} catch (SQLException e) {
System.out.println( "sql数据库查询异常");
e.printStackTrace();
}
return rs;
}
public static void closeConn(){
try {
conn.close();
} catch (SQLException e) {
System.out.println( "sql数据库关闭异常");
e.printStackTrace();
}
}
}
     
     

3.编写实体类

     
     
package model;

public class TestCase {
private int id;
private String caseName;
private String caseDetail;
private String caseDevice;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCaseName() {
return caseName;
}
public void setCaseName(String caseName) {
this.caseName = caseName;
}
public String getCaseDetail() {
return caseDetail;
}
public void setCaseDetail(String caseDetail) {
this.caseDetail = caseDetail;
}
public String getCaseDevice() {
return caseDevice;
}
public void setCaseDevice(String caseDevice) {
this.caseDevice = caseDevice;
}

}
     
     

4.新建一个分页实体类，以便后期数据做分页

     
     
package model;

import java.util.List;

public class TestCaseTotal {
private int total;
private List<TestCase> rows;


public TestCaseTotal() {
}
public TestCaseTotal(int total, List<TestCase> rows) {
this.total = total;
this.rows = rows;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public List<TestCase> getRows() {
return rows;
}
public void setRows(List<TestCase> rows) {
this.rows = rows;
}

}
     
     

5.基础操作写到一个接口里

     
     
package model;

import java.util.List;


public interface TestCaseDao {
public List<TestCase> getCaseAll();
public boolean addCase(TestCase testCase) ;
public boolean deleteCase(int id) ;
public boolean updateCase(TestCase testCase) ;

}
     
     

6.实现Dao接口

     
     
package model;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;



public class TestCaseDaoImpl implements TestCaseDao {
private PreparedStatement ptmt = null;
private ResultSet rs = null;
@Override
public List<TestCase> getCaseAll() {
// TODO Auto-generated method stub
List<TestCase> list = new ArrayList<TestCase>();
try {
DBconn.init();
ResultSet rs = DBconn.selectSql( "select * from testcase");
while(rs.next()){
TestCase testCase= new TestCase();
testCase.setId(rs.getInt( "caseId"));
testCase.setCaseName(rs.getString( "caseName"));
testCase.setCaseDetail(rs.getString( "caseDetail"));
testCase.setCaseDevice(rs.getString( "caseDevice"));

list.add(testCase);
}
DBconn.closeConn();
return list;
} catch (SQLException e) {
e.printStackTrace();
}
return null;

}

@Override
public boolean addCase(TestCase testCase) {
// TODO Auto-generated method stub
boolean flag = false;
DBconn.init();
int i =DBconn.addUpdDel( "insert into user(caseName,caseDetail,caseDevice) " +
"values('"+testCase.getCaseName()+ "','"+testCase.getCaseDetail()+ "','"+testCase.getCaseDevice()+ "')");
if(i> 0){
flag = true;
}
DBconn.closeConn();
return flag;
}

@Override
public boolean deleteCase(int id) {
// TODO Auto-generated method stub
boolean flag = false;
DBconn.init();
String sql = "delete from testcase where caseId="+id;


int i =DBconn.addUpdDel(sql);
if(i> 0){
flag = true;
}
DBconn.closeConn();
return flag;


}

@Override
public boolean updateCase(TestCase testCase) {
// TODO Auto-generated method stub
return false;
}

}
     
     

7.新建JsonServlet

     
     
package model;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.gson.Gson;



public class JsonServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {


TestCaseDaoImpl testCaseDaoImpl= new TestCaseDaoImpl();
List<TestCase> list=testCaseDaoImpl.getCaseAll();
List<TestCase> list1 = new ArrayList<>();
int size =list.size();
TestCase testCase;
for( int i= 0;i<size;i++){
testCase= new TestCase();
testCase.setId(list.get(i).getId());
testCase.setCaseName(list.get(i).getCaseName());
testCase.setCaseDetail(list.get(i).getCaseDetail());
list1.add(testCase);

}

String page = req.getParameter( "page");
// 将数据添加到数组
List<TestCase> caselist = new ArrayList<TestCase>();

//以下代码做分页，写的不好，不喜勿喷
if (page == null || page.equals( "0")) {
if(list1.size()> 9){
for( int i= 0;i< 10;i++){
caselist.add(list1.get(i));
}
}
else{
for( int i= 0;i<list1.size();i++){
caselist.add(list1.get(i));
}
}

}
else {
int caseSize=list1.size();
int page1 =caseSize/ 10;

int pageNum=Integer.parseInt(page);
//String parm=Integer.toString(a);
if(pageNum<page1){
for( int i= 10*pageNum;i< 10*pageNum+ 10;i++){
caselist.add(list1.get(i));
}
}
else{
for( int i= 10*pageNum;i<list1.size();i++){
caselist.add(list1.get(i));
}
}

}


TestCaseTotal nt = new TestCaseTotal(caselist.size(), caselist);

// 调用GSON jar工具包封装好的toJson方法，可直接生成JSON字符串
Gson gson = new Gson();
String json = gson.toJson(nt);

// 输出到界面
System.out.println(json);
resp.setContentType( "text/plain");
resp.setCharacterEncoding( "gb2312");
PrintWriter out = new PrintWriter(resp.getOutputStream());
out.print(json);
out.flush();

}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}

}
     
     

8.新建index.jsp

     
     
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>Test Json1 </title>


<meta http-equiv="Content-Type" content="text/html"; charset=UTF-8>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>
<body >
<form action="getJson" method="get">
<input type="submit" value="点击获取测试用例数据"/>
</form>
</body>
</html>
     
     

9.修改web.xml文件如下

     
     
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JsonTest </display-name>
<welcome-file-list>
<welcome-file>index.jsp </welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>JsonServlet </servlet-name>
<servlet-class>model.JsonServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>JsonServlet </servlet-name>
<url-pattern>/getJson </url-pattern>
</servlet-mapping>
</web-app>
     
     

10.右击项目名-->选择Run as-->选择Run on Server

11.运行成功后如下：

每页只展示10条数据，若需要查看第二页数据传入参数page =1即可

				<script>
					(function(){
						function setArticleH(btnReadmore,posi){
							var winH = $(window).height();
							var articleBox = $("div.article_content");
							var artH = articleBox.height();
							if(artH > winH*posi){
								articleBox.css({
									'height':winH*posi+'px',
									'overflow':'hidden'
								})
								btnReadmore.click(function(){
									if(typeof window.localStorage === "object" && typeof window.csdn.anonymousUserLimit === "object"){
										if(!window.csdn.anonymousUserLimit.judgment()){
											window.csdn.anonymousUserLimit.Jumplogin();
											return false;
										}else if(!currentUserName){
											window.csdn.anonymousUserLimit.updata();
										}
									}
									
									articleBox.removeAttr("style");
									$(this).parent().remove();
								})
							}else{
								btnReadmore.parent().remove();
							}
						}
						var btnReadmore = $("#btn-readmore");
						if(btnReadmore.length>0){
							if(currentUserName){
								setArticleH(btnReadmore,3);
							}else{
								setArticleH(btnReadmore,1.2);
							}
						}
					})()
				</script>
				</article>

最近在测试中发现mysql数据库保存测试用例，测试结果是一种不错的选择，为了后期方便在客户端展示测试，便写了个接口。此次接口开发不使用任何框架，需下载gson.jar，mysql-connector.jar，servlet-api.jar，以下为接口的开发思路

1.创建数据表，我这边使用的是mysql数据库

  
  
/*
SQLyog 企业版 - MySQL GUI v8.14
MySQL - 5.5.49 : Database - test
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/ `test` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `test`;

/*Table structure for table `testcase` */

DROP TABLE IF EXISTS `testcase`;

CREATE TABLE `testcase` (
`caseId` INT( 11) NOT NULL AUTO_INCREMENT,
`caseName` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
`caseDetail` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
`caseDevice` VARCHAR( 255) CHARACTER SET latin1 NOT NULL,
PRIMARY KEY ( `caseId`)
) ENGINE= INNODB AUTO_INCREMENT= 48 DEFAULT CHARSET=utf8 CHECKSUM= 1 DELAY_KEY_WRITE= 1 ROW_FORMAT=DYNAMIC;

/*Data for the table `testcase` */

INSERT INTO `testcase`( `caseId`, `caseName`, `caseDetail`, `caseDevice`) VALUES ( 2, '2', '233', '444'),( 16, 'dsf', 'sf', 'sfd'),( 17, 'safd', 'sadf', 'asf'),( 18, 'saf', 'ggd', 'sdf'),( 19, 'dsaf', 'sdf', 'sdf'),( 20, 'sfd', 'sfd', '(NfdsULL)'),( 21, 'sdf', 'v', 'v'),( 22, 'f', 'f', 'e'),( 23, 'w', 'r3', 'rt'),( 24, 'er', 'rtrt', 'sfad'),( 25, 'sf', 'sdf', 'fds'),( 26, 'sa', 's', 's'),( 27, 'e', 'e', 'e'),( 28, 'sa', 'rt', 'rt'),( 29, 'we', 'ew', 'qw'),( 30, 'we', '(NULfL)', 'dsf'),( 31, 'fd', 's', 'g'),( 32, 's', 'g', 'f'),( 33, 'sf', 'f', 'f'),( 34, 'c', 'c', 'c'),( 35, 'e', 'e', 'e'),( 36, 'd', 'd', 'q'),( 37, 'q', 'e', 'r'),( 38, 'f', 'r', 'g'),( 39, 'g', '(NULgL)', 'g'),( 40, 'gg', 'g', 'd'),( 41, 'f', 'f', 'f'),( 42, 'f', 'f', 'f'),( 43, 'f', 'f', 'f'),( 44, 'v', 'f', 'g'),( 45, 'e', 'e', 'r'),( 46, '4', 'rt', 'fg'),( 47, 'dsf', 'ds', 'sdf');

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
  
  

2.编写数据库工具类

  
  
package model;

import java.sql.*;

public class DBconn {
static String url = "jdbc:mysql://localhost:3306/test?useunicuee=true& characterEncoding=utf8";
static String username = "root";
static String password = "123456";
static Connection conn = null;
static ResultSet rs = null;
static PreparedStatement ps = null;
public static void init(){
try {
Class.forName( "com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url,username,password);
} catch (Exception e) {
System.out.println( "init [SQL驱动程序初始化失败！]");
e.printStackTrace();
}
}
public static int addUpdDel(String sql){
int i = 0;
try {
PreparedStatement ps = conn.prepareStatement(sql);
i = ps.executeUpdate();
} catch (SQLException e) {
System.out.println( "sql数据库增删改异常");
e.printStackTrace();
}

return i;
}
public static ResultSet selectSql(String sql){
try {
ps = conn.prepareStatement(sql);
rs = ps.executeQuery(sql);
} catch (SQLException e) {
System.out.println( "sql数据库查询异常");
e.printStackTrace();
}
return rs;
}
public static void closeConn(){
try {
conn.close();
} catch (SQLException e) {
System.out.println( "sql数据库关闭异常");
e.printStackTrace();
}
}
}
  
  

3.编写实体类

  
  
package model;

public class TestCase {
private int id;
private String caseName;
private String caseDetail;
private String caseDevice;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCaseName() {
return caseName;
}
public void setCaseName(String caseName) {
this.caseName = caseName;
}
public String getCaseDetail() {
return caseDetail;
}
public void setCaseDetail(String caseDetail) {
this.caseDetail = caseDetail;
}
public String getCaseDevice() {
return caseDevice;
}
public void setCaseDevice(String caseDevice) {
this.caseDevice = caseDevice;
}

}
  
  

4.新建一个分页实体类，以便后期数据做分页

  
  
package model;

import java.util.List;

public class TestCaseTotal {
private int total;
private List<TestCase> rows;


public TestCaseTotal() {
}
public TestCaseTotal(int total, List<TestCase> rows) {
this.total = total;
this.rows = rows;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public List<TestCase> getRows() {
return rows;
}
public void setRows(List<TestCase> rows) {
this.rows = rows;
}

}
  
  

5.基础操作写到一个接口里

  
  
package model;

import java.util.List;


public interface TestCaseDao {
public List<TestCase> getCaseAll();
public boolean addCase(TestCase testCase) ;
public boolean deleteCase(int id) ;
public boolean updateCase(TestCase testCase) ;

}
  
  

6.实现Dao接口

  
  
package model;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;



public class TestCaseDaoImpl implements TestCaseDao {
private PreparedStatement ptmt = null;
private ResultSet rs = null;
@Override
public List<TestCase> getCaseAll() {
// TODO Auto-generated method stub
List<TestCase> list = new ArrayList<TestCase>();
try {
DBconn.init();
ResultSet rs = DBconn.selectSql( "select * from testcase");
while(rs.next()){
TestCase testCase= new TestCase();
testCase.setId(rs.getInt( "caseId"));
testCase.setCaseName(rs.getString( "caseName"));
testCase.setCaseDetail(rs.getString( "caseDetail"));
testCase.setCaseDevice(rs.getString( "caseDevice"));

list.add(testCase);
}
DBconn.closeConn();
return list;
} catch (SQLException e) {
e.printStackTrace();
}
return null;

}

@Override
public boolean addCase(TestCase testCase) {
// TODO Auto-generated method stub
boolean flag = false;
DBconn.init();
int i =DBconn.addUpdDel( "insert into user(caseName,caseDetail,caseDevice) " +
"values('"+testCase.getCaseName()+ "','"+testCase.getCaseDetail()+ "','"+testCase.getCaseDevice()+ "')");
if(i> 0){
flag = true;
}
DBconn.closeConn();
return flag;
}

@Override
public boolean deleteCase(int id) {
// TODO Auto-generated method stub
boolean flag = false;
DBconn.init();
String sql = "delete from testcase where caseId="+id;


int i =DBconn.addUpdDel(sql);
if(i> 0){
flag = true;
}
DBconn.closeConn();
return flag;


}

@Override
public boolean updateCase(TestCase testCase) {
// TODO Auto-generated method stub
return false;
}

}
  
  

7.新建JsonServlet

  
  
package model;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.gson.Gson;



public class JsonServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {


TestCaseDaoImpl testCaseDaoImpl= new TestCaseDaoImpl();
List<TestCase> list=testCaseDaoImpl.getCaseAll();
List<TestCase> list1 = new ArrayList<>();
int size =list.size();
TestCase testCase;
for( int i= 0;i<size;i++){
testCase= new TestCase();
testCase.setId(list.get(i).getId());
testCase.setCaseName(list.get(i).getCaseName());
testCase.setCaseDetail(list.get(i).getCaseDetail());
list1.add(testCase);

}

String page = req.getParameter( "page");
// 将数据添加到数组
List<TestCase> caselist = new ArrayList<TestCase>();

//以下代码做分页，写的不好，不喜勿喷
if (page == null || page.equals( "0")) {
if(list1.size()> 9){
for( int i= 0;i< 10;i++){
caselist.add(list1.get(i));
}
}
else{
for( int i= 0;i<list1.size();i++){
caselist.add(list1.get(i));
}
}

}
else {
int caseSize=list1.size();
int page1 =caseSize/ 10;

int pageNum=Integer.parseInt(page);
//String parm=Integer.toString(a);
if(pageNum<page1){
for( int i= 10*pageNum;i< 10*pageNum+ 10;i++){
caselist.add(list1.get(i));
}
}
else{
for( int i= 10*pageNum;i<list1.size();i++){
caselist.add(list1.get(i));
}
}

}


TestCaseTotal nt = new TestCaseTotal(caselist.size(), caselist);

// 调用GSON jar工具包封装好的toJson方法，可直接生成JSON字符串
Gson gson = new Gson();
String json = gson.toJson(nt);

// 输出到界面
System.out.println(json);
resp.setContentType( "text/plain");
resp.setCharacterEncoding( "gb2312");
PrintWriter out = new PrintWriter(resp.getOutputStream());
out.print(json);
out.flush();

}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}

}
  
  

8.新建index.jsp

  
  
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>Test Json1 </title>


<meta http-equiv="Content-Type" content="text/html"; charset=UTF-8>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>
<body >
<form action="getJson" method="get">
<input type="submit" value="点击获取测试用例数据"/>
</form>
</body>
</html>
  
  

9.修改web.xml文件如下

  
  
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JsonTest </display-name>
<welcome-file-list>
<welcome-file>index.jsp </welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>JsonServlet </servlet-name>
<servlet-class>model.JsonServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>JsonServlet </servlet-name>
<url-pattern>/getJson </url-pattern>
</servlet-mapping>
</web-app>
  
  

10.右击项目名-->选择Run as-->选择Run on Server

11.运行成功后如下：

每页只展示10条数据，若需要查看第二页数据传入参数page =1即可