springmvc Controller接收前端参数的几种方式总结

 

(1) 普通方式-请求参数名和Controller方法的参数一致

 

 1 @Controller
 2 @RequestMapping("/param")
 3 public class TestParamController {
 4     private static final Logger logger = LoggerFactory.getLogger(TestParamController.class);
 5     /**
 6      * 请求参数名和Controller方法的参数一致
 7      * produces 设置返回参数的编码格式可以设置返回数据的类型以及编码,可以是json或者xml
 8      * {
 9      *     @RequestMapping(value="/xxx",produces = {"application/json;charset=UTF-8"})
10      *      或
11      *     @RequestMapping(value="/xxx",produces = {"application/xml;charset=UTF-8"})
12      *      或
13      *     @RequestMapping(value="/xxx",produces = "{text/html;charset=utf-8}")
14      * }
15      * @param name 用户名
16      * @param pwd 密码
17      * @return
18      *
19      */
20     @RequestMapping(value = "/add", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
21     @ResponseBody
22     public String addUser(String name, String pwd){
23         logger.debug("name:" + name + ",pwd:" + pwd);
24         return "name:" + name + ",pwd:" + pwd;
25     }
26 
27 }

如下图所示:

通过访问:http://localhost:8080/sty/param/add.action?name=张三&pwd=123456

          

 

 (2) 对象方式-请求参数名和Controller方法中的对象的参数一致

 

@Controller
@RequestMapping("/param")
public class TestParamController {
    private static final Logger logger = LoggerFactory.getLogger(TestParamController.class);
    /**
     * 请求参数名和Controller方法的参数一致
     * produces 设置返回参数的编码格式可以设置返回数据的类型以及编码,可以是json或者xml
     * }
     * @param user 用户信息
     * @return
     *
     */
    @RequestMapping(value = "/addByObject", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByObject(User user){
        logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());
        return "name:" + user.getName() + ",pwd:" + user.getPwd();
    }
}

如下图所示:

通过访问:http://localhost:8080/sty/param/addByObject.action?name=张三&pwd=123456

 

 

(3) 自定义方法参数名-当请求参数名与方法参数名不一致时

 

  注意可以在参数中增加@RequestParam注解。如果在方法中的参数增加了该注解,说明请求的url必须带该带有该参数,否则不能执行该方法。如果在方法中的参数没有增加该注解,说明请求的url无需带有该参数,也能继续执行该方法。

  @RequestParam(defaultValue="0")可设置默认值(仅当传入参数为空时)。

  @RequestParam(value="id")可接受传入参数为id的值,覆盖该注解注释的字段。

  @RequestParam(name="name",defaultValue = "李四") String u_name   如果传入字段”name”为空,默认u_name的值为”李四”。若传入”name”不为空,默认u_name值为传入值。

以下只该出方法:

/**
 * 自定义方法参数名-当请求参数名与方法参数名不一致时
 * @param u_name 用户名
 * @param u_pwd 密码
 * @return
 */
@RequestMapping(value = "/addByDifName", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUserByDifName(@RequestParam("name") String u_name, @RequestParam("pwd")String u_pwd){
    logger.debug("name:" + u_name + ",pwd:" + u_pwd);
    return "name:" + u_name + ",pwd:" + u_pwd;
}

如下图所示:

通过访问:http://localhost:8080/sty/param/addUserByDifName.action?name=张三&pwd=123456

 

 

(4) HttpServletRequest方式

 

  以下只给出该方法:

/**

 * 通过HttpServletRequest接收

 * @param request

 * @return

 */

@RequestMapping(value = "/addByHttpServletRequest", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})

@ResponseBody

public String addUserByHttpServletRequest(HttpServletRequest request){

    String name = request.getParameter("name");

    String pwd = request.getParameter("pwd");

    logger.debug("name:" + name + ",pwd:" + pwd);

    return "name:" + name + ",pwd:" + pwd;

}

如下图所示:

通过访问:http://localhost:8080/sty/param/addByHttpServletRequest.action?name=张三&pwd=123456

 

 

(5) @PathVariable获取路径中的参数接收

 

         参考:https://www.iteye.com/blog/zhlj11-1885005

   注:url含有中文名称时,因为编码问题,无法进行映射,需要修改tomcat下的conf文件夹下的server.xml中的URIEncoding=”UTF-8”,对URL编码设置就可以解决中文问题。

对于经常遇到路径在有符号”.”问题,因为springmvc默认是把点后面的信息作为文件后缀,需要修改默认值:

<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"> 
              <property name="interceptors" ref="localeChangeInterceptor"/>
              <property name="useDefaultSuffixPattern" value="false" /> 
       </bean> 

  另外,这时候如果只设置这个,请求可以传递到对于的controller,但传过去的数据会有问题,只会传最后一个点前面的数据,除非你在最后加上“/”,比如/news/测试.点/  这样就会把“测试.点”当作整体,不然只会得到“测试”。这时候我们可以这样设置@RequestMapping("/news/{title:.*}") 

以下只给出该方法(本次不进行中文及特殊符号测试):

/**

 * 通过@PathVariable获取路径中的参数 

 * @param name 用户名

 * @param pwd 密码

 * @return

 */

@RequestMapping(value = "/add/{name}/{pwd}", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})

@ResponseBody

public String addUserByPathVariable(@PathVariable String name, @PathVariable String pwd){

    logger.debug("name:" + name + ",pwd:" + pwd);

    return "name:" + name + ",pwd:" + pwd;

}

 

如下图所示:

通过访问:http://localhost:8080/sty/param/add/zhangsan/123456.action

 

 

(6) @RequestBody-JSON方式接收

 

  以上方式(1)/(2)/)(3)/(4)/(5)都是非JSON方式,也就是说如果使用JSON方式提交,会报错(在第二种对象方式中,将get请求方式修改为POST,并将上送数据修改为JSON串方式):

       此时未引入jackson-databind.jar依赖。并在springmvc.xml文件未进行开启json格式的支持,也就是说未加入以下代码:

<!-- 同时开启json格式的支持-->
<mvc:annotation-driven></mvc:annotation-driven>

  提交请求打印未有报错,但是返回的数据为null,如图所示:

   

         若开启json格式的支持,测试也如上图所示,也并能正常返回。

         原因:因为为在字段名称之前未使用@RequestBody注解。

eg1(测试普通对象)

         代码如下所示,

/**

 * RequestBody-JSON 对象方式

 * @param user

 * @return

 */

@RequestMapping(value = "/addByObjectJSON", produces = {"application/json;charset=UTF-8"})

@ResponseBody

public String addUserByObjectJSON(@RequestBody User user){

    logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());

    return "name:" + user.getName() + ",pwd:" + user.getPwd();

}
测试结果如图所示(访问 http://localhost:8080/sty/param/addByObjectJSON.action ):

 

eg2(测试List对象)

代码如下所示,

/**
 * RequestBody-JSON List对象方式
 * @param users
 * @return
 */
@RequestMapping(value = "/addByListJSON", produces = {"application/json;charset=UTF-8"})
@ResponseBody
public String addUsersByListJSON(@RequestBody List<User> users){
    StringBuilder sb = new StringBuilder("{");
    if(null != users){
        for(User user : users){
            sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");
        }
    }
    sb.append("}");
    logger.debug(sb.toString());
    return sb.toString();
}

   测试结果

  测试结果如图所示(访问 http://localhost:8080/sty/param/addByListJSON.action  ):

   

eg3(测试Map对象)

代码如下图所示:

/**

 * RequestBody-JSON Map对象方式

 * @param users

 * @return

 */

@RequestMapping(value = "/addByMapJSON", produces = {"application/json;charset=UTF-8"})

@ResponseBody

public String addUsersByMapJSON(@RequestBody Map<String, User> users){

    StringBuilder sb = new StringBuilder("{");

    if(null != users){

        Iterator it = users.keySet().iterator();

        while(it.hasNext()){

            User user = users.get(it.next());

            sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");

        }

    }

    sb.append("}");

    logger.debug(sb.toString());

    return sb.toString();

}

   测试结果

测试结果如图所示(访问 http://localhost:8080/sty/param/addByMapJSON.action ):

另外附部分源码:

  User.java

package com.mjs.study.action.dto;

/**
 * @Description 
 * @ClassName User
 * @Author Administrator
 * @Data 2019/10/13 2:43
 * @Version 1.0
 */
public class User {
    private String name;
    private String pwd;
    private String sex;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}
View Code
 TestParamController.java 
package com.mjs.study.action;

import com.github.pagehelper.PageInfo;
import com.mjs.study.action.dto.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * @Description 测试springmvc传入参数
 * @ClassName TestParamController
 * @Author Administrator
 * @Data 2019/10/13 1:33
 * @Version 1.0
 */
@Controller
@RequestMapping("/param")
public class TestParamController {
    private static final Logger logger = LoggerFactory.getLogger(TestParamController.class);
    /**
     * 请求参数名和Controller方法的参数一致
     * produces 设置返回参数的编码格式 可以设置返回数据的类型以及编码,可以是json或者xml
     * {
     *     @RequestMapping(value="/xxx",produces = {"application/json;charset=UTF-8"})
     *      或
     *     @RequestMapping(value="/xxx",produces = {"application/xml;charset=UTF-8"})
     *      或
     *     @RequestMapping(value="/xxx",produces = "{text/html;charset=utf-8}")
     * }
     * @param name 用户名
     * @param pwd 密码
     * @return
     *
     */
    @RequestMapping(value = "/add", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUser(String name, String pwd){
        logger.debug("name:" + name + ",pwd:" + pwd);
        return "name:" + name + ",pwd:" + pwd;
    }

    /**
     * 自定义方法参数名-当请求参数名与方法参数名不一致时
     * @param u_name 用户名
     * @param u_pwd 密码
     * @return
     */
    @RequestMapping(value = "/addByDifName", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByDifName(@RequestParam(name="name",defaultValue = "李四") String u_name, @RequestParam("pwd")String u_pwd){
        logger.debug("name:" + u_name + ",pwd:" + u_pwd);
        return "name:" + u_name + ",pwd:" + u_pwd;
    }

    /**
     * 请求参数名和Controller方法的参数一致
     * produces 设置返回参数的编码格式 可以设置返回数据的类型以及编码,可以是json或者xml
     * @param user 用户信息
     * @return
     *
     */
    @RequestMapping(value = "/addByObject", produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByObject(User user){
        logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());
        return "name:" + user.getName() + ",pwd:" + user.getPwd();
    }

    /**
     * RequestBody-JSON 对象方式
     * @param user
     * @return
     */
    @RequestMapping(value = "/addByObjectJSON", produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByObjectJSON(@RequestBody User user){
        logger.debug("name:" + user.getName() + ",pwd:" + user.getPwd());
        return "name:" + user.getName() + ",pwd:" + user.getPwd();
    }

    /**
     * RequestBody-JSON List对象方式
     * @param users
     * @return
     */
    @RequestMapping(value = "/addByListJSON", produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUsersByListJSON(@RequestBody List<User> users){
        StringBuilder sb = new StringBuilder("{");
        if(null != users){
            for(User user : users){
                sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");
            }
        }
        sb.append("}");
        logger.debug(sb.toString());
        return sb.toString();
    }
    /**
     * RequestBody-JSON Map对象方式
     * @param users
     * @return
     */
    @RequestMapping(value = "/addByMapJSON", produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUsersByMapJSON(@RequestBody Map<String, User> users){
        StringBuilder sb = new StringBuilder("{");
        if(null != users){
            Iterator it = users.keySet().iterator();
            while(it.hasNext()){
                User user = users.get(it.next());
                sb.append("{" + "name:" + user.getName() + ",pwd:" + user.getPwd() + "}");
            }
        }
        sb.append("}");
        logger.debug(sb.toString());
        return sb.toString();
    }
    /**
     * 通过HttpServletRequest接收
     * @param request
     * @return
     */
    @RequestMapping(value = "/addByHttpServletRequest", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByHttpServletRequest(HttpServletRequest request){
        String name = request.getParameter("name");
        String pwd = request.getParameter("pwd");
        logger.debug("name:" + name + ",pwd:" + pwd);
        return "name:" + name + ",pwd:" + pwd;
    }

    /**
     * 通过@PathVariable获取路径中的参数
     * @param name 用户名
     * @param pwd 密码
     * @return
     */
    @RequestMapping(value = "/add/{name}/{pwd}", method = RequestMethod.GET, produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public String addUserByPathVariable(@PathVariable String name, @PathVariable String pwd){
        logger.debug("name:" + name + ",pwd:" + pwd);
        return "name:" + name + ",pwd:" + pwd;
    }
}
View Code

  该部分和个人github部分内容同步。

posted on 2019-10-13 18:50  轻浅初夏  阅读(38870)  评论(0编辑  收藏  举报

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