控制器返回json代码：

package com.trol;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.entity.User;

@Controller
public class UserController {
	@RequestMapping("/listJson")
	@ResponseBody
	public User list(){
		User user = new User();
		user.setPwd("bbb");
		return user;
	}
	@RequestMapping("/{id}/delete")
	public String delete(@PathVariable int id){
		System.out.println("delete--"+id);
		return "index";
	}

}

实体类：

package com.entity;
import java.io.Serializable;

public class User implements Serializable {
	//私有字段;
	private String username;
	private String pwd;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPwd() {
		return pwd;
	}
	public void setPwd(String pwd) {
		this.pwd = pwd;
	}
	
	
}