参数

1.@RequestParam

主要来是于URL，如 小编的主页地址，就是这种参数。

2.@RequestBody

主要来自表单信息，通过POST的方式把表单的信息传到后台。

3.@RequestHeader

求请的表单头。一般用来放浏览器信息，cookies等信息。

代码实例

下面通过一个实例来说明Spring MVC 参数的设置，网络传输抓包，以及前端的调用。

服务层代码

import io.swagger.annotations.Api;import io.swagger.annotations.ApiOperation;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import java.sql.SQLException;import java.util.List;@CrossOrigin@RestController@Api(value = "Test", description = "Test")public class Test {        @ApiOperation(value = "参数测试")    @RequestMapping(path = "test/paramTest", method = RequestMethod.POST)    public String paramTest(            @RequestParam String OperateType ,            @RequestBody InputClass inp,            @RequestHeader String  token    ) {        return "Richy's Test";    }}

实体层

package rui.tools.service.Test;public class InputClass {   private   String attr1;   private  String attr2;    public String getAttr1() {        return attr1;    }    public void setAttr1(String attr1) {        this.attr1 = attr1;    }    public String getAttr2() {        return attr2;    }    public void setAttr2(String attr2) {        this.attr2 = attr2;    }}

前端测试

 function f_c() {            var url = ";;            var opt = {                attr1: "a",                attr2: "b",            };            $.ajax({                type: "POST",                url: url,                headers: {                  token:'key'                },                data: JSON.stringify(opt),                contentType: "application/json",                success: function (data) {                    alert(data)                },                error: function (data) { alert("error"); }            });        }

@RequestParam对应的是URL的参数

@RequestBody对应的 是Form 的值

@RequestHeader 对应是 Head的参数

如下图所示

浏览器网络分析

补充

因为是前后端分离，需要注意跨域的处理

本例子使用后台设置header允许跨域访问

代码如下：

import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class WebFillter implements Filter {    public void destroy() {    }    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)            throws IOException, ServletException {        HttpServletRequest request = (HttpServletRequest) req;        HttpServletResponse response = (HttpServletResponse) res;        String originHeader = request.getHeader("Origin");        response.setHeader("Access-Control-Allow-Origin", originHeader);        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");        response.setHeader("Access-Control-Max-Age", "0");        response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");        response.setHeader("Access-Control-Allow-Credentials", "true");        response.setHeader("XDomainRequestAllowed", "1");        response.setHeader("XDomainRequestAllowed", "1");        chain.doFilter(request, response);    }    public void init(FilterConfig arg0) throws ServletException {    }}

最后小编整理来自：，CSDN博主「Richy Liu」

你觉得今天小编整理的这个干货怎么样，觉得还行的话建议收藏评论哦！不介意的话可以点个关注转发哦，后续小编会根据各位的需求整理有效有用的资料分享哦！谢谢大家支持！一起加油哦！