問題描述

在用springmvc返回json串的時候，頁面上只顯示一個鍵值對，如圖

目的是要獲取這個樣子的

{'text':'文本','flag':'文本'}

為什么會出現這種只有第一個鍵值對的情況。

contraller

import com.dcxm.stu.bean.Message;import com.dcxm.stu.bean.Student;import com.dcxm.stu.service.RegisterService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;@RestController@RequestMapping('/student')public class RegisterController { private Student student = new Student(); @Autowired private RegisterService registerService; @RequestMapping(value = '/register') public Message register(HttpServletRequest request, Model model) {student.setTelphone('13245648');student.setPassword('123465');System.out.println(registerService.studentRegister(student));return registerService.studentRegister(student); }}

在這個代碼的末尾輸出返回值任就是 正確的信息，但是在網頁上顯示就不真確了。

RegisterService

import com.dcxm.stu.bean.Message;import com.dcxm.stu.bean.Student;import com.dcxm.stu.dao.impl.RegisterDaoImpl;import com.dcxm.stu.service.RegisterService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class RegisterServiceImpl implements RegisterService { @Autowired private RegisterDaoImpl registerDao; public Message studentRegister(Student student) {String telphoneNew = student.getTelphone();System.out.println('new Tel ' + telphoneNew);Message message = new Message();int row = registerDao.insertInfo(student);if (row == 1) { message.setText('注冊成功'); message.setFlag('true');} else { message.setText('電話號碼已經被注冊'); message.setFlag('false');}return message; }}

Message

public class Message { private String flag; private String text; public void setText(String text) {this.text = text; } public String getText() {return text; }public Message() { } public Message(String text, String flag) {this.flag = flag;this.text = text; } @Override public String toString() {return text + ' ' + flag; } public void setFlag(String flag) {this.flag = flag; }}

上面是問題代碼。

后來我寫了一個簡單的測試

@RestControllerpublic class StudentInfo { Student student = new Student(); @RequestMapping('/test') public Student getStudentInfo(){student.setUsername('123');student.setPassword('123');student.setTelphone('123');//language=JSONreturn student; }}

卻能正確的返回json

{'username':'123','password':'123','telphone':'123'}

問題解答

Message缺少：

public String getFlag() { return flag;}