springMVC编写服务接口——四种入参方式（@PathVariable、@RequestParam、@RequestBody、HttpServletRequest）

1、@PathVariable

rest调用方式，http://localhost:8881/xxxxx/demoServ/testByParam_Path/muyunfei/111

//reset特殊参数，获取路径中的参数,如：http://localhost:8881/xxxxx/demoServ/testByParam_Path/muyunfei/1111
@RequestMapping(value="/testByParam_Path/{username}/{password}",method=RequestMethod.GET)
public String addUser4(@PathVariable String username,@PathVariable String password) {
return "hello "+username+" ----"+password;

}

//返回一个对象
@RequestMapping(value="/testByParam_object/{username}/{id}",method=RequestMethod.GET)
public Usertest testByParam_object(@PathVariable String username,@PathVariable long id) {
Usertest test = new Usertest();
test.setUsename(username);
test.setId(BigDecimal.valueOf(id));
return test;

}2、@RequestParam

正常的http传参方式， http://localhost:8881/xxxxx/demoServ/testByParam_Normal?userName=111&userPwd=muyunfei
//有普通参数,http://localhost:8881/xxxxx/demoServ/testByParam_Normal?userName=111&userPwd=muyunfei
@RequestMapping(value="testByParam_Normal",method = RequestMethod.GET)
public String testByParam_Normal(@RequestParam("userName") long name,@RequestParam("userPwd")String pwd){
System.out.println("修改代码无需重启!!!+++--");
return demoServiceImpl.HelloWord( name, pwd);
}3、@RequestBody
输入参数为一个实体

//传入一个对象,返回一个对象
@RequestMapping(value="/testByParam_object3",method=RequestMethod.POST)
public String testByParam_object3(@RequestBody Usertest user) {
System.out.println("接收到对象："+user.getUsename());
return "!!!!";
}调用时，可以使用restTemplate.exchange进行传递实体，httpclient没找出来，有实现的读者可以发一下，感谢啊
4、HttpServletRequest

通过流的方式传递

//用于httpclient调用
@RequestMapping(value="testByParam_Normal_httpclient",method = RequestMethod.POST)
public String testByParam_Normal_httpclient(HttpServletRequest req){
try {
InputStream in = req.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuffer str = new StringBuffer("");
String temp ="";
while((temp=reader.readLine())!=null){
str.append(temp);
}
System.out.println(str.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return demoServiceImpl.HelloWord( 2222, "3333");
}