spring mvc+ajax 实现json格式数据传递

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$.ajax({
    url: "api/user",
    type: "POST",		
    timeout: txnTimeOut,
    async: true,
    dataType: "json",
    data: {username : "lucy"},
    
    //contentType:'application/json;charset=UTF-8',
    success: function(e){
      if($.txnIsSuzccess(e.respCode)){
        //window.location.href=e.codeUrl;
        console.log(e);
      }else{
        exceptionHandle(e);
      }
    },
    error: function(e){
      errorHandle(e);
    }
});

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contentType:'application/json;charset=UTF-8',

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@PostMapping(value = "/api/user", produces = "application/json;charset=utf-8")

public Student (String username) {
  
      /* 逻辑代码 */
    return null;
}

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//produces属性表示返回数据类型为json
produces = "application/json;charset=utf-8"

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$.ajax({
    url: "find",
    type: "POST",		
    timeout: txnTimeOut,
    async: true,
    contentType: 'application/json;charset=UTF-8',//关键是要加上这行
    dataType: "json",
    data: '{"name":"手机","price":999}',
    success: function(e){
      if($.txnIsSuzccess(e.respCode)){
        console.log(e);
      }else{
        exceptionHandle(e);
      }
    },
    error: function(e){
      errorHandle(e);
    }
});

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//consumes的作用是指定请求数据的格式类型,可以同时指定数据格式类型以及字符编码
//produces的作用是指定返回值类型,不但可以设置返回值类型还可以设定返回值的字符编码

@PostMapping(value = "/find", consumes = "application/json;charset=utf-8", produces = "application/json;charset=utf-8")

public User findUserByName(@RequestBody User user) {
    log.info("user>>>>>   " + user);
    return userService.findByName("");
}

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//contentType指定传递的数据为json字符串(如果不指定为application/json;charset=UTF-8,
//后台无法进行参数绑定)
contentType: 'application/json;charset=UTF-8',//关键是要加上这行
  
//dataType指定返回的数据为json数据格式
dataType: "json",

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//consumes的作用是指定请求数据的格式类型,可以同时指定数据格式类型以及字符编码
//produces的作用是指定返回值类型,不但可以设置返回值类型还可以设定返回值的字符编码

@PostMapping(value = "/find", consumes = "application/json;charset=utf-8", produces = "application/json;charset=utf-8")
//@RequestBody注解用来接受json数据,进行参数绑定(如果不在参数前使用此注解,无法进行参数绑定)
//@ResponseBody注解用来生成json数据
public User findUserByName(@RequestBody User user)

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/**
 * Created by zhouxu on 2017/12/15 15:58.
 */

public class User {
    private String name;
    private double price;
    public User() {
    }
    public User(String name, double price) {
        this.name = name;
        this.price = price;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + ''' +
                ", price=" + price +
                '}';
    }
}

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//请求key/value，输出是json

function responseJson(){
	
	$.ajax({
		type:'post',
		url:'api/user',
		//请求是key/value这里不需要指定contentType，因为默认就 是key/value类型
		//contentType:'application/json;charset=utf-8',
		//数据格式是json串，商品信息
		data:'name=手机&price=999',
		success:function(data){//返回json结果
			alert(data.name);
		}
      
	});
}

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@PostMapping(value = "/api/user")

public User findUserByName(@RequestParam(value = "name") String name, @RequestParam(value = "price") double price) {
    //System.out.println("name>>>>>>>>" + name + "    price>>>>>>>>" + price);
    log.info("name>>>>>>>>" + name + "    price>>>>>>>>" + price);
    return userService.findByName(name);
}