web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>HttpServer</display-name> <filter> <filter-name>UserPermissionFilter</filter-name> <filter-class>filter.UserPermissionFilter</filter-class> </filter> <filter-mapping> <filter-name>UserPermissionFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <display-name>LoginServlet</display-name> <servlet-name>LoginServlet</servlet-name> <servlet-class>servlet.LoginServlet</servlet-class> </servlet> <servlet> <display-name>PostXMLServlet</display-name> <servlet-name>PostXMLServlet</servlet-name> <servlet-class>servlet.PostXMLServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/LoginServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>PostXMLServlet</servlet-name> <url-pattern>/PostXMLServlet</url-pattern> </servlet-mapping> </web-app>
login.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <form action="LoginServlet" method="post"> username:<input type="text" name="username"/><br/> password:<input type="password" name="password"/><br/> <input type="submit" value="login"/> </form> </body> </html>
main.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <h1>This is the main page.</h1> </body> </html>
UserPermissionFilter.java
package filter; import java.io.IOException; import java.util.Arrays; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; public class UserPermissionFilter implements Filter { private String[] excludedUri={"/HttpServer/LoginServlet", "/HttpServer/PostXMLServlet"}; public void destroy() {} public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest=(HttpServletRequest) request; if(!Arrays.asList(excludedUri).contains(httpRequest.getRequestURI())){ String user=(String) httpRequest.getSession().getAttribute("user"); if(user==null||"".equals(user)){ request.getRequestDispatcher("/login.jsp") .forward(request, response); return; } } chain.doFilter(request, response); } public void init(FilterConfig fConfig) throws ServletException {} }
LoginServlet.java
package servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username=request.getParameter("username"); String password=request.getParameter("password"); if("admin".equals(username)&&"admin".equals(password)){ request.getSession().setAttribute("user", username); response.getWriter().write("Login Success!"); }else{ response.sendRedirect("/HttpServer/login.jsp"); } } }
PostXMLServlet.java
package servlet; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class PostXMLServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { BufferedReader br = new BufferedReader( new InputStreamReader(request.getInputStream())); String line=null; while((line=br.readLine())!=null){ System.out.println(line); } br.close(); } }
HttpServer用于接收客户端请求。除了请求路径/HttpServer/LoginServlet和/HttpServer/PostXMLServlet都要做用户校验。如果校验为通过则返回login.jsp页面。
二 客户端测试
要引入外部jar包 httpclient-4.2.3.jar httpcore-4.2.2.jar commons-logging-1.0.4.jar
1.测试用户登录
LoginClient.java
package http.client; import http.Utils; import java.net.URI; import java.util.ArrayList; import java.util.List; import org.apache.http.Header; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.HTTP; public class LoginClient { @SuppressWarnings("deprecation") public static void main(String[] args) throws Exception { HttpClient httpclient = new DefaultHttpClient(); /* initialize the request method */ // prepare the request url HttpPost httpPost = new HttpPost("http://localhost:7070/HttpServer/LoginServlet"); // prepare the request parameters List<NameValuePair> params=new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("username","admin")); params.add(new BasicNameValuePair("password","admin")); // set the request entity httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8)); /* execute the request */ System.out.println("executing request " + httpPost.getURI()); HttpResponse response = httpclient.execute(httpPost); /* check whether it has relocated */ int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == HttpStatus.SC_MOVED_TEMPORARILY || statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_SEE_OTHER || statusCode == HttpStatus.SC_TEMPORARY_REDIRECT){ Header[] headers = response.getHeaders("location"); if (headers != null) { httpPost.releaseConnection(); String newUrl = headers[0].getValue(); httpPost.setURI(URI.create(newUrl)); response = httpclient.execute(httpPost); } } /* print the result of the request */ Utils.printResponse(response); // Do not feel like reading the response body // Call abort on the request object httpPost.abort(); // When HttpClient instance is no longer needed, // shut down the connection manager to ensure // immediate deallocation of all system resources httpclient.getConnectionManager().shutdown(); } }
如果传入的用户名密码正确那直接返回login success成功信息,否则返回login.jsp页面。
2. 通过2次请求直接访问main.jsp页面。第一次请求用户登录,第二次请求则访问main.jsp
RequestMainClient.java
package http.client; import http.Utils; import java.util.ArrayList; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.HTTP; public class RequestMainClient { @SuppressWarnings("deprecation") public static void main(String[] args)throws Exception { HttpClient httpclient = new DefaultHttpClient(); /* execute login operation */ // prepare the request url HttpPost httpPost = new HttpPost("http://localhost:7070/HttpServer/LoginServlet"); // prepare the request parameters List<NameValuePair> params=new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("username","admin")); params.add(new BasicNameValuePair("password","admin")); // set the request entity httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8)); System.out.println("executing request " + httpPost.getURI()); HttpResponse response =httpclient.execute(httpPost); /* request main page */ httpPost.releaseConnection(); httpPost=new HttpPost("http://localhost:7070/HttpServer/main.jsp"); response = httpclient.execute(httpPost); /* print the result of the request */ Utils.printResponse(response); // Do not feel like reading the response body // Call abort on the request object httpPost.abort(); // When HttpClient instance is no longer needed, // shut down the connection manager to ensure // immediate deallocation of all system resources httpclient.getConnectionManager().shutdown(); } }
如果第一次请求登录成功则第二次请求可以直接访问main.jsp, 否则第二次将会返回login.jsp
3.提交实体数据(这里为xml文件)
PostXMLClient.java
package http.client; import http.Utils; import java.io.File; import java.net.URL; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.FileEntity; import org.apache.http.impl.client.DefaultHttpClient; public class PostXMLClient { public static void main(String[] args) throws Exception { HttpClient httpclient = new DefaultHttpClient(); /* initialize the request method */ // prepare the request url HttpPost httpPost = new HttpPost("http://localhost:7070/HttpServer/PostXMLServlet"); URL url=PostXMLClient.class.getClassLoader().getResource("http/fruits.xml"); File file=new File(url.getFile()); System.out.println(file.exists()); httpPost.setEntity(new FileEntity(file,ContentType.TEXT_XML)); /* execute operation */ System.out.println("executing request " + httpPost.getURI()); HttpResponse response =httpclient.execute(httpPost); /* print the result of the request */ Utils.printResponse(response); // Do not feel like reading the response body // Call abort on the request object httpPost.abort(); // When HttpClient instance is no longer needed, // shut down the connection manager to ensure // immediate deallocation of all system resources httpclient.getConnectionManager().shutdown(); } }
fruits.xml
<?xml version="1.0" encoding="UTF-8"?> <fruits> <fruit> <name>apple</name> <price>10</price> </fruit> <fruit> <name>orange</name> <price>4</price> </fruit> </fruits>
Utils.java
package http; import java.io.BufferedReader; import java.io.InputStreamReader; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; public class Utils { public static void printResponse(HttpResponse response)throws Exception{ /* print the result of the request */ HttpEntity entity = response.getEntity(); System.out.println("--------------------"); // print the status line System.out.println(response.getStatusLine()); // print the headers System.out.println("========== headers =========="); Header[] headers=response.getAllHeaders(); for(Header header:headers){ System.out.println(header); } // print the content length if (entity != null) { System.out.println("\nResponse content length: "+ entity.getContentLength()); } // print the entity content System.out.println("\n========== response content =========="); BufferedReader is=new BufferedReader( new InputStreamReader(entity.getContent())); String line=null; while((line=is.readLine())!=null){ System.out.println(line); } System.out.println("--------------------"); } }