SPRINGMVC for RESTful services

We use the SSM environment to build the SSM environment to integrate General Mapper and Pagehelper to illustrate the SPRINGMVC implementation of restful services. Querying Resources

Test:
New Resources

First Test:

This time the show has been added successfully. Let's see if this data exists in the database.

We are re-submitting this time:
Update Resources

By default, the put request is not able to submit the form data, and you need to add a filter in Web. XML to resolve:

    <!--solve the problem of put requests not submitting form data-
    <filter>
        <filter-name>HttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
    < /filter>
    <filter-mapping>
        <filter-name>HttpMethodFilter</filter-name>
        < Url-pattern>/*</url-pattern>
    </filter-mapping>

Test:

Delete a resource

You need to add a filter in Web. XML to resolve an issue where delete requests cannot submit form data:

<!--convert the 
        POST request to delete or put
        to specify a true request parameter with _method-
    <filter>
        <filter-name >HiddenHttpMethodFilter</filter-name>
        <filter-class> org.springframework.web.filter.hiddenhttpmethodfilter</filter-class>
    </filter>
    < filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/* </url-pattern>
    </filter-mapping>

Test:

Controller Code

Package My.ssm.controller;
Import My.ssm.pojo.User;

Import My.ssm.service.UserService;
Import org.springframework.beans.factory.annotation.Autowired;
Import Org.springframework.http.HttpStatus;
Import org.springframework.http.ResponseEntity;
Import Org.springframework.stereotype.Controller;
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;


Import Org.springframework.web.bind.annotation.ResponseBody; @RequestMapping ("New/user") @Controller public class Newusercontroller {@Autowired private userservice Userservi

    Ce Query user information based on user ID @RequestMapping (value = "{id}", method = Requestmethod.get) @ResponseBody public responseentit Y<user> Queryuserbyid (@PathVariable ("id") Long ID) {try {User user = This.userService.queryUse
          Rbyid (ID);  if (null = = user) {//resource does not exist, response 404 return Responseentity.status (httpstatus.not_found). Bo
            DY (null);
            }//resource present, response to//return Responseentity.status (Httpstatus.ok). body (user);
        return Responseentity.ok (user);
        } catch (Exception e) {e.printstacktrace ();
    } return Responseentity.status (Httpstatus.internal_server_error). body (null);
    }/** * Added user * * @param users * @return */@RequestMapping (method = Requestmethod.post) Public responseentity<void> saveuser (user user) {try {Boolean bool = This.userService.save
            User (user);
            if (bool) {//Added successfully, responds 201 return Responseentity.status (httpstatus.created). build ();
        }} catch (Exception e) {e.printstacktrace (); }//New failure, response to return Responseentity.status (httpstatus.internal_server_error). build (); }/** * Update users * @param user * @return */@RequestMapping (method = Requestmethod.put) Publi C responseentity<void> updateUser (user user) {try {Boolean bool = This.userService.updateUser (
            user);
            if (bool) {//update succeeded, Response 204 return Responseentity.status (httpstatus.no_content). build ();
        }} catch (Exception e) {e.printstacktrace ();
    }//Added failure to respond to the return Responseentity.status (httpstatus.internal_server_error). build ();
    }/** * Delete user * * @param ID * @return */@RequestMapping (method = Requestmethod.delete)
            Public responseentity<void> DeleteUser (@RequestParam (value = "id", DefaultValue = "0") Long ID) {try { if (id.longvalue () = = 0) {//No parameters are passed, response status code is Responseentity.status (HTT pstatus.bad_request). build ();
            } Boolean bool = This.userService.deleteUser (ID);
            if (bool) {//delete succeeded, Response 204 return Responseentity.status (httpstatus.no_content). build ();
        }} catch (Exception e) {e.printstacktrace ();
    }//delete failed with response to the return Responseentity.status (httpstatus.internal_server_error). build ();
 }

}

Service Code

Package my.ssm.service;

Import java.util.List;
Import My.ssm.bean.EasyUIResult;
Import My.ssm.mapper.UserMapper;

Import My.ssm.pojo.User;
Import org.springframework.beans.factory.annotation.Autowired;

Import Org.springframework.stereotype.Service;
Import Com.github.abel533.entity.Example;
Import Com.github.pagehelper.PageHelper;

Import Com.github.pagehelper.PageInfo;

    @Service public class UserService {@Autowired private usermapper usermapper; Public easyuiresult queryuserlist (integer page, integer rows) {//Set paging parameter Pagehelper.startpage (page, rows

        );
        Query User data Example Example = new Example (user.class); Example.setorderbyclause ("Updated DESC");

        Set sorting criteria list<user> users = this.userMapper.selectByExample (example);

        Get the information after paging pageinfo<user> PageInfo = new pageinfo<user> (users);
    return new Easyuiresult (Pageinfo.gettotal (), pageinfo.getlist ()); } public User QueryuserByid (Long ID) {return this.userMapper.selectByPrimaryKey (ID);
    Public Boolean saveuser (user user) {return this.userMapper.insert (user) = = 1;
    Public Boolean updateUser (user user) {return this.userMapper.updateByPrimaryKeySelective (user) = = 1;
    } public Boolean DeleteUser (Long ID) {return this.userMapper.deleteByPrimaryKey (id) = = 1;
 }


}