Spring MVC各种提交形式以及参数接收（form表单提交以及Json提交）

一晃就到了11月30号了，明天就是2018年的最后一个月份了，时间呀！！！！

form表单参数接收的三种方式：

1. HttpServletRequest

    @RequestMapping(value = "/getParmByReq.do", method = RequestMethod.POST)
    @ResponseBody
    public String getParmByReq(HttpServletRequest request) {
        String name = request.getParameter("name");
        int age = Integer.parseInt(request.getParameter("age"));
        System.out.println("接收到的参数,name=" + name + ";age=" + age);
        return "接收到的参数,name=" + name + ";age=" + age;
    }

用curl 测试结果： （-d 表示post请求）

curl   -d "name=admin&age=34"   http://localhost:8080/ssm-req/form/getParmByReq.do

3. 一个个参数接收，单个参数按照名称接收：

  @RequestMapping(value = "/requestParam.do", method = RequestMethod.POST)
    @ResponseBody
    public String getBarBySimplePathWithRequestParam(
            @RequestParam(value = "name") String name,
            @RequestParam(value = "age") Integer age
    ) {
        System.out.println("接收到的参数,name=" + name + ";age=" + age);
        return "接收到的参数,name=" + name + ";age=" + age;
    }

用curl 测试结果:

curl   -d "name=ceshi&age=22"   http://localhost:8080/ssm-req/form/requestParam.do

4. 自定义实体类接收，使用注解：@ModelAttribute

  @RequestMapping(value = "modelAttribute.do", method = RequestMethod.POST)
    @ResponseBody
    public String getModelAttribute(@ModelAttribute() User user) {
        System.out.println("接收到的参数,name=" + user.getName() + ";age=" + user.getAge());
        return "接收到的参数,name=" + user.getName() + ";age=" + user.getAge();
    }

用curl 测试结果:

curl   -d "name=jaywei&age=33"   http://localhost:8080/ssm-req/form/modelAttribute.do

5. 不用流的形式接收

    @RequestMapping(value = "/getNotStream.do")
    @ResponseBody
    public String getNotStream(String order) {
        JSONObject jsonObject = JSONObject.parseObject(order);

        System.out.println("接收到的参数,name=" + jsonObject.getString("name") + ";age=" + jsonObject.getString("age"));
        return "接收到的参数,name=" + jsonObject.getString("name") + ";age=" + jsonObject.getString("age");
    }

用curl 测试结果

curl   -d "order={'name':'张三','age':12}"   http://localhost:8080/ssm-req/form//getNotStream.do

小结：
推荐使用：@ModelAttribute 接收参数的方式。
PS: 解决中文乱码问题，在web.xml文件中加入字符过滤器：

<filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

JSON提交参数接收

使用@RequestBody注解，该注解是将参数放在请求体中

  @RequestMapping(value = "getJson2.do",produces = "application/json")
    public String getJson2(@RequestBody String userStr) {
        User user = JSON.parseObject(userStr, User.class);
        System.out.println("接收到的参数,name=" + user.getName() + ";age=" + user.getAge());
        return JSON.toJSONString("接收到的参数,name=" + user.getName() + ";age=" + user.getAge());
    }

用curl测试结果

curl   -H "Content-Type:application/json" -X POST -d "{'name':'sange','age':12}"   http://localhost:8080/ssm-req/json/getJson2.do

源码地址：
https://github.com/XWxiaowei/JavaWeb/tree/master/ssm-request-demo


作者：码农飞哥

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