SpringMVC 接受前端传递的数据
1、新建User.java
package pojo;
public class User {
private String name;
private String pwd;
private String sex;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
2、TestParamController.java文件
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import pojo.User;
@Controller
@RequestMapping("/param")
public class TestParamController {
/**
* produces 设置返回参数的编码格式 可以设置返回数据的类型以及编码，可以是json或者xml
* @ResponseBody 将java对象转为json格式的数据
*/
private static Logger logger = LogManager.getLogger(TestParamController.class.getName());
/**
* 普通方式，请求的参数名和Controller方法的参数一致
* @param name
* @param pwd
* @return
*/
@RequestMapping(value = "/add", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUser(String name, String pwd) {
logger.debug("name:" + name + ",pwd:"+pwd);
return "name:" + name + ",pwd:" + pwd;
}
/**
* 对象方式，请求的参数名和Controller方法中的对象的参数一致
* @param user
* @return
*/
@RequestMapping(value = "/addByObject", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByObject(User user) {
logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());
return "name:" + user.getName() + ",pwd:" + user.getPwd();
}
/**
* 自定义方法参数名-当请求参数名与方法参数名不一致时
* @param u_name
* @param u_pwd
* @return
*/
@RequestMapping(value = "/addByDifName", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByDifName(@RequestParam("name") String u_name, @RequestParam("pwd")String u_pwd){
logger.debug("name:" + u_name + ",pwd:" + u_pwd);
return "name:" + u_name + ",pwd:" + u_pwd;
}
/**
* 通过HttpServletRequest接收
* @param request
* @return
*/
@RequestMapping(value = "/addByHttpServletRequest", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByHttpServletRequest(HttpServletRequest request){
String name = request.getParameter("name");
String pwd = request.getParameter("pwd");
logger.debug("name:" + name + ",pwd:" + pwd);
return "name:" + name + ",pwd:" + pwd;
}
/**
*@PathVariable获取路径中的参数接收
* @param name
* @param pwd
* @return
*/
@RequestMapping(value = "/add/{name}/{pwd}", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByPathVariable(@PathVariable String name, @PathVariable String pwd){
logger.debug("name:" + name + ",pwd:" + pwd);
return "name:" + name + ",pwd:" + pwd;
}
/**
* @RequestBody-JSON方式接收
* @param user
* @return
*/
@RequestMapping(value = "/addByObjectJSON", produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByObjectJSON(@RequestBody User user){
logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());
return "name:" + user.getName() + ",pwd:" + user.getPwd();
}
/**
* RequestBody-JSON List对象方式
* @param users
* @return
*/
@RequestMapping(value = "/addByListJSON", produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUsersByListJSON(@RequestBody List<User> users){
StringBuilder sb = new StringBuilder("{");
if(null != users){
for(User user : users){
sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");
}
}
sb.append("}");
logger.debug(sb.toString());
return sb.toString();
}
/**
* RequestBody-JSON Map对象方式
* @param users
* @return
*/
@RequestMapping(value = "/addByMapJSON", produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUsersByMapJSON(@RequestBody Map<String, User> users){
StringBuilder sb = new StringBuilder("{");
if(null != users){
Iterator it = users.keySet().iterator();
while(it.hasNext()){
User user = users.get(it.next());
sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");
}
}
sb.append("}");
logger.debug(sb.toString());
return sb.toString();
}
}
3、pom.xml文件
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springContext.xml</param-value>
</context-param>
<context-param>
<param-name>log4jConfiguration</param-name>
<param-value>classpath:log4j2.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
4、依次使用postman进行测试
5、另外这里对 http://localhost:8080/SpringReceive/param/addByObjectJSON.action 的测试需要注意，我在实验的过程中出现了415错误，找了许多解决，最终下面的方法解决
（1）需要在修改pom.xml
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.6</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.6</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.6</version>
</dependency>
（2）修改SpringContext.xml文件，加入
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<!-- 设置返回字符串编码 -->
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name = "supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
<!-- json转换器 -->
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>
（3）解决
参考：
前端向后端传递数据：https://www.cnblogs.com/mjs154/p/11667796.html
415错误解决：https://blog.csdn.net/weixin_39841589/article/details/82056337
积沙成塔
