1.HttpservletRequest
HttpservletRequest request代表的是客户端的请求。当客户端通过http协议访问服务器的时候，http请求头中的所有信息，都封装在这个对象中，通过这个对象提供的方法，就可以获得客户端请求的所有信息。
以用户注册为例，当用户注册店铺时，用户需要在前端提交店铺的相关信息，这个店铺的信息都会被保存这个request中，返回值类型是Map类型，用来返回必要的健值对结果。
新建工具类HttpServletRequestUtil.java，从HttpServletRequest对象中获取相关的值
package com.csj2018.o2o.util;
import javax.servlet.http.HttpServletRequest;
public class HttpServletRequestUtil {
public static int getInt(HttpServletRequest request, String key) {
try {
return Integer.decode(request.getParameter(key));
}catch (Exception e) {
return -1;
}
}
public static long getLong(HttpServletRequest request, String key) {
try {
return Long.valueOf(request.getParameter(key));
}catch (Exception e) {
return -1L;
}
}
public static Double getDouble(HttpServletRequest request, String key) {
try {
return Double.valueOf(request.getParameter(key));
}catch (Exception e) {
return -1d;
}
}
public static boolean getBoolean(HttpServletRequest request, String key) {
try {
return Boolean.valueOf(request.getParameter(key));
}catch (Exception e) {
return false;
}
}
public static String getString(HttpServletRequest request, String key) {
try {
String result = request.getParameter(key);
if(result != null) {
result = result.trim();
}
if("".equals(result)) {
result = null;
}
return result;
}catch (Exception e) {
return null;
}
}
}Jackson-databind
<!-- json解析 -->
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>package com.csj2018.o2o.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
class MyValue{
public String name;
public int age;
}
public class TestJackson {
private static Logger logger = LoggerFactory.getLogger(TestJackson.class);
public static void main(String[] args) {
ObjectMapper mapper = new ObjectMapper();
try {
//读取json
MyValue value = mapper.readValue("{\"name\":\"Bob\",\"age\":15}", MyValue.class);
logger.warn("姓名："+value.name+"\t年龄："+value.age);
//写入json
String jsonString = mapper.writeValueAsString(value);
logger.warn("json结果："+jsonString.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}
ShopManagerController.java
package com.csj2018.o2o.web.shopadmin;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import java.io.InputStream;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import com.csj2018.o2o.dto.ShopExecution;
import com.csj2018.o2o.entity.PersonInfo;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.enums.ShopStateEnum;
import com.csj2018.o2o.service.ShopService;
import com.csj2018.o2o.util.HttpServletRequestUtil;
import com.csj2018.o2o.util.ImageUtil;
import com.csj2018.o2o.util.PathUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
@Controller
@RequestMapping("/shopadmin")
public class ShopManagerController {
//注入一个ShopService，提供服务
@Autowired
private ShopService shopService;
@RequestMapping(value="/registershop",method=RequestMethod.POST)
@ResponseBody
private Map<String,Object> registerShop(HttpServletRequest request){
//先定义一个返回值
Map<String,Object> modelMap = new HashMap<String,Object>();
//1.接收并转换相应的参数，包括店铺信息以及图片信息
String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
//将json转换为Shop实例
ObjectMapper mapper = new ObjectMapper();
Shop shop = null;
try {
shop = mapper.readValue(shopStr, Shop.class);
}catch(Exception e) {
modelMap.put("success",false);
modelMap.put("errMeg",e.getMessage());
return modelMap;
}
//将请求中的文件流剥离出来，通过CommonsMultipartFile去接收
CommonsMultipartFile shopImg = null;
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(
request.getSession().getServletContext());
if(commonsMultipartResolver.isMultipart(request)) {
MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;
shopImg = (CommonsMultipartFile) multipartHttpServletRequest.getFile("shopImg");
}else {
modelMap.put("success",false);
modelMap.put("errMsg", "上传图片不能为空");
return modelMap;
}
//2.注册店铺
if(shop != null && shopImg != null) {
PersonInfo owner = new PersonInfo();
//以后会完善，从Session获取
owner.setUserId(1L);
shop.setOwner(owner);
File shopImgFile = new File(PathUtil.getImgBasePath()+ImageUtil.getRandomFileName());
try {
shopImgFile.createNewFile();
}catch (IOException e) {
modelMap.put("success",false);
modelMap.put("errMsg", e.getMessage());
return modelMap;
}
try {
inputStreamToFile(shopImg.getInputStream(),shopImgFile);
}catch(Exception e) {
modelMap.put("success",false);
modelMap.put("errMsg", e.getMessage());
return modelMap;
}
ShopExecution se = shopService.addShop(shop,shopImgFile);
if(se.getState() == ShopStateEnum.CHECK.getState()) {
modelMap.put("success",true);
}else {
modelMap.put("success",false);
modelMap.put("errMsg", se.getStateInfo());
return modelMap;
}
return modelMap;
}else {
modelMap.put("success",false);
modelMap.put("errMsg", "请输入店铺信息");
return modelMap;
}
}
private static void inputStreamToFile(InputStream inputStream,File file) {
FileOutputStream os = null;
try {
os = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[1024];
while((bytesRead=inputStream.read(buffer))>0) {
os.write(buffer,0,bytesRead);
}
}catch (Exception e) {
throw new RuntimeException("调用inputStreamToFile产生异常："+e.getMessage());
}finally {
try {
if(os != null) {
os.close();
}
if(inputStream != null) {
inputStream.close();
}
}catch (IOException e) {
throw new RuntimeException("调用inputStreamToFile产生异常："+e.getMessage());
}
}
}
}