Question

你好我是Spring，Rest和servlets的新手。我构建了一个示例，其中包含一个从用户获取3个参数并在浏览器中打印它们的函数。不，我执行以下命令：

http://localhost:8080/springexample/getMails/setup/user/1234/matant@gmail/

我得到：

 HTTP Status 400 - Required String parameter 'username' is not present

type Status report

message Required String parameter 'username' is not present

description The request sent by the client was syntactically incorrect.

这是我的代码：

    package com.javacodegeeks.snippets.enterprise;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
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.RequestParam;

@Controller
@RequestMapping("/getMails")
public class GetEmail {

        @RequestMapping(value = "/setup/{username}/{pass}/{host}/", method = RequestMethod.GET)
        public String Setup(@RequestParam("username") String username,@RequestParam("pass") String pass,@RequestParam("host") String host ,ModelMap model,HttpServletRequest request) {
            model.addAttribute("msg","user = "+username+","+"pass = "+pass+","+"host = "+host);
            return "helloWorld";
        }

        @RequestMapping(value = "/displayMessage/{msg}", method = RequestMethod.GET)
        public String displayMessage(@PathVariable String msg, ModelMap model) {
            model.addAttribute("msg", msg);
            return "helloWorld";
        }

        @RequestMapping(value = "/knainz", method = RequestMethod.GET)
        public String knainz(ModelMap model) {
            model.addAttribute("msg", "JCG Hello World2222!");
            return "helloWorld";
        }

        @RequestMapping(value = "/func1/{message}", method = RequestMethod.GET)
        public String func1(@PathVariable String message,ModelMap model) {
            model.addAttribute("msg", message);
            return "helloWorld";
        }

    }

Answer 1

您将@RequestParam与@PathVariable混淆。变化

@RequestMapping(value = "/setup/{username}/{pass}/{host}/", method = RequestMethod.GET)
    public String Setup(@RequestParam("username") String username,@RequestParam("pass") String pass,@RequestParam("host") String host ,ModelMap model,HttpServletRequest request) {
        model.addAttribute("msg","user = "+username+","+"pass = "+pass+","+"host = "+host);
        return "helloWorld";
    }

到

@RequestMapping(value = "/setup/{username}/{pass}/{host}/", method = RequestMethod.GET)
    public String Setup(@PathVariable("username") String username,@PathVariable("pass") String pass,@PathVariable("host") String host ,ModelMap model,HttpServletRequest request) {
        model.addAttribute("msg","user = "+username+","+"pass = "+pass+","+"host = "+host);
        return "helloWorld";
    }

发送参数时始终获取状态400

1 个答案: