SpringMVC RESTful 实践demo

1.REST是一种web service架构风格，而不是技术，如果一个架构符合REST原则，就称它为RESTful架构。

RESTful风格的架构都是对资源的操作，所有资源应该是名词而不是动词。

创建一个资源 : POST 
检索一个资源 : GET
更新一个资源: PUT 
删除一个资源: DELETE 

下面是一个实例演示怎样使用HTTP的请求来操作资源。

GET:   /students   将返回所有student的信息

GET:   /students/101  将返回id为101的学生信息 

POST：  /students/101  将新建id为101的学生信息 

PUT:   /students/101  将更新id为101的学生信息 

DELETE:   /students/101  将删除id为101的学生信息 

2.pom.xml文件如下：

	4.0.0
	com.example
	SpringMVC_RESTful
	war
	0.0.1-SNAPSHOT
	SpringMVC_RESTful Maven Webapp
	http://maven.apache.org
	
		
			junit
			junit
			3.8.1
			test
		
		
			org.springframework
			spring-context
			4.3.1.RELEASE
		
		
			org.springframework
			spring-aop
			4.3.1.RELEASE
		
		
			org.springframework
			spring-webmvc
			4.3.1.RELEASE
		
		
			org.springframework
			spring-web
			4.3.1.RELEASE
		
		
			org.springframework
			spring-tx
			4.1.6.RELEASE
		
		
			javax.servlet
			javax.servlet-api
			3.1.0
		
		
			commons-logging
			commons-logging
			1.1
		
		
			com.fasterxml.jackson.core
			jackson-databind
			2.5.0
		
	
	
		SpringMVC_RESTful
	

2.web.xml文件如下：

  
    index.jsp
  


    springmvc
    org.springframework.web.servlet.DispatcherServlet
    
          contextConfigLocation
          /WEB-INF/springmvc-servlet.xml
      
      

 

    springmvc
    /

3.springmvc-servlet.xml文件如下：

4.实体类

package com.example.model;

public class Student { private long id; private String name; private String sex; public Student() { } public Student( String name, String sex) { super(); this.name = name; this.sex = sex; } public Student(long id, String name, String sex) { super(); this.id = id; this.name = name; this.sex = sex; } public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } }

 

5.DAO

package com.example.dao;

import java.util.List;

import com.example.model.Student;

public interface StudentDao {
	public Student addStudent(Student student);
	public long deleteStudent(Long id);
	public Student queryOneStudent(Long id);
	public Student changeStudent(Student student);
	public List getStudentList();
}

6.StudentDaoImpl

package com.example.dao.impl;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Repository;

import com.example.dao.StudentDao;
import com.example.model.Student;

@Repository("studentDao")
public class StudentDaoImpl implements StudentDao {
	
	private static List students;
	{
		students = new ArrayList();
		students.add(new Student(101, "Mike", "male"));
		students.add(new Student(102, "Huang", "male"));
		students.add(new Student(103, "Mao", "female"));
	}

	public Student addStudent(Student student) {
		//student.setId(System.currentTimeMillis());
		students.add(student);
		return student;
	}

	public long deleteStudent(Long id) {
		for (Student student : students) {
			if (student.getId() == id){
				students.remove(student);
				return id;
			}
		}
		return id;
	}

	public Student queryOneStudent(Long id) {
		for (Student student : students) {
			if (student.getId() == id){
				return student;
			}
		}
		return null;
	}

	public Student changeStudent(Student student) {
		for (Student s : students) {
			if (s.getId() == student.getId()){
				return student;
			}
		}
		return null;
	}

	public List getStudentList() {
		return students;
	}

}

7.控制层，这里将对应HTTP请求的方式，在RequestMethod中选择方式，用@PathVariable注解来标记id。

package com.example.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import com.example.dao.StudentDao;
import com.example.model.Student;


@RestController()
public class StudentController {
	
	@Autowired
	private StudentDao studentDao;
	
	@RequestMapping(value = "/students", method = RequestMethod.GET)
	@ResponseBody
	public List getStudentList() {
		List students = studentDao.getStudentList();
		return students;
	}
	
	@RequestMapping(value = "/students/{id}", method = RequestMethod.GET)

	public ResponseEntity  queryOneStudent(@PathVariable("id") long id) {
		Student student = studentDao.queryOneStudent(id);
		return new ResponseEntity(student,HttpStatus.OK);
	}
	
	@RequestMapping(value = "/students/{id}", method = RequestMethod.DELETE)
	public ResponseEntity deleteStudent(@PathVariable("id") long id) {
		long showId = studentDao.deleteStudent(id);
		return new ResponseEntity(showId,HttpStatus.OK);
	}
	
	@RequestMapping(value = "/students/{id}", method = RequestMethod.POST)
	public ResponseEntity addStudent(@PathVariable("id") long id) {
		Student student = new Student(id,"rex", "male");
		student = studentDao.addStudent(student);
		return new ResponseEntity(student,HttpStatus.OK);
	}
	
	@RequestMapping(value = "/students/{id}", method = RequestMethod.PUT)
	public ResponseEntity changeStudent(@PathVariable("id") long id) {
		Student student = new Student(id,"leona", "female");
		student = studentDao.changeStudent(student);
		return new ResponseEntity(student,HttpStatus.OK);
	}
	
}

8.使用google浏览器的扩展应用 POSTMAN 来进行测试，可以很方便的选择请求方式。