@ResponseBody
params="json":访问我这个方法的时候一定要有参数名为json
返回值User
jackson-all-1.9.0.jar
    @RequestMapping(value="/{nickname}",method=RequestMethod.GET,params="json")
@ResponseBody
public User show(@PathVariable String nickname){
System.out.println(nickname);
return users.get(nickname);
}

http://localhost:7070/SSM/user/lisi?json

aaarticlea/png;base64,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" 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