spring-mvc json

web

• 导入三个包
  # pom.xml

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.7.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.7.5</version>
</dependency>

• 写一个类
  # user.java

package com.xie.pojo;
public class user {
    private String xie;
    private String yxin;
    private String godlikexie;
    public String getXie() {
        return xie;
    }
    public void setXie(String xie) {
        this.xie = xie;
    }
    public String getYxin() {
        return yxin;
    }
    public void setYxin(String yxin) {
        this.yxin = yxin;
    }
    public String getGodlikexie() {
        return godlikexie;
    }
    public void setGodlikexie(String godlikexie) {
        this.godlikexie = godlikexie;
    }
    @Override
    public String toString() {
        return "user [xie=" + xie + ", yxin=" + yxin + ", godlikexie=" + godlikexie + "]";
    }
}

• 输出json
  # TestJson.java

package com.pollux.controller;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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 com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
@Controller
public class TestJson {
    @ResponseBody
    @RequestMapping(value = "testjsonbean", method = RequestMethod.GET)
    public user testjsonbean() {
        user user = new user();
        user.setXie("godlikexie");
        user.setYxin("yxin");
        return user;
    }
    @ResponseBody
    @RequestMapping(value = "testjsonlist" , method = RequestMethod.GET)
    public List<String> testjsonlist(){
            List<String> xie = new ArrayList<String>();
            xie.add("godlikexie");
            xie.add("xie");
            xie.add("yxin");
            return xie;
    }
    @ResponseBody
    @RequestMapping(value = "testjsonmap" , method = RequestMethod.GET)
    public Map<String,String> testjsonmap(){
            Map<String,String> xie = new HashMap<String,String>();
            xie.put("xie", "isgod");
            xie.put("yxin", "ismywife");
            xie.put("godlikexie", "invincible");
            return xie;
    }
    @ResponseBody
    @RequestMapping(value = "testdojson", method = RequestMethod.GET,produces = "text/html;charset=UTF-8")
    public String testdojson() throws JsonParseException, JsonMappingException, IOException {
        String json = "{\"xie\":\"isgod\",\"yxin\": \"godness\",\"godlikexie\": \"invincible\"}";
        ObjectMapper objectMapper = new ObjectMapper();
        String jsonresult = null;
        user user = objectMapper.readValue(json, user.class);
        if (user != null) {
            jsonresult = user.toString();
            System.out.println(jsonresult);
        }
        return jsonresult;
    }
}

//输出结果
{"username":"godlikexie","password":"yxin"}
["godlikexie","xie","yxin"]
{"xie":"god","yxin":"godness","godlikexie":"invincible"}

• 解析Json

@ResponseBody
    @RequestMapping(value = "testdojson", method = RequestMethod.GET)
    public String testdojson() throws JsonParseException, JsonMappingException, IOException {
        String json = "{\"xie\":\"isgod\",\"yxin\": \"godness\",\"godlikexie\": \"invincible\"}";
        ObjectMapper objectMapper = new ObjectMapper();
        String jsonresult = null;
        user user = objectMapper.readValue(json, user.class);
        if (user != null) {
            jsonresult = user.toString();
            System.out.println(jsonresult);
        }
        return jsonresult;
    }

//输出结果
user [xie=isgod, yxin=godness, godlikexie=invincible]