【SSH小Demo】个人信息展示页面——注解方式

我不是女神ヾ 2022-04-05 10:53 257阅读 0赞

上两篇文章介绍了使用SSH制作的一个个人信息小Demo，本篇文章将记录使用注解来完成开发，不得不说，使用注解的的确确能减少我们的不少工作量，同时也能减少我们出错率，我之前曾经试过在xml文件配置时打错一个英文字母，导致改了好久的BUG~~

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70][]

注意！struts2要想使用注解，必须要有struts2-convention-plugin-x.x.x.jar 这个jar包

![20181212104641124.png][]

引入jar包后就先修改applicationContext.xml

1.增加注解配置，组建扫描

<context:annotation-config />
    <context:component-scan base-package="com.zdxh" />

2. 注释掉 action,service,dao

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 1][]  
3. 替换SessionFactory类

org.springframework.orm.hibernate3.LocalSessionFactoryBean

替换为

org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean

4. 去掉

![2018121210555953.png][]

替换为

<property name="packagesToScan">
      <list>
         <value>com.zdxh.*</value>
      </list>
    </property>

然后再修改修改struts.xml

注释掉action配置

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
     
    <struts>
      <constant name="struts.i18n.encoding" value="UTF-8"></constant>
       
      <constant name="struts.objectFactory" value="spring"/>
       
      <package name="basicstruts" extends="struts-default">
       
      
       
      </package>
    </struts>

为PeopleAction添加注解

1. 配置Namespace，ParentPackage，Results

2. 使用@Autowired自动装配peopleService  
3. 在list()方法前加注解 @Action("listPeople")，以映射路径,其他也照此模仿

package com.zdxh.action;
    
    import java.util.List;
    
    import org.apache.struts2.convention.annotation.Action;
    import org.apache.struts2.convention.annotation.Namespace;
    import org.apache.struts2.convention.annotation.ParentPackage;
    import org.apache.struts2.convention.annotation.Result;
    import org.apache.struts2.convention.annotation.Results;
    import org.springframework.beans.factory.annotation.Autowired;
    
    import com.zdxh.pojo.People;
    import com.zdxh.service.PeopleService;
    import com.zdxh.util.Page;
    
    
    @Namespace("/")
    @ParentPackage("struts-default")
    @Results({
    	@Result(name="listPeople", location="/WEB-INF/jsp/listPeople.jsp"),
    	@Result(name="listPeopleAction",type="redirect", location="/listPeople"),
    	@Result(name="editPeople", location="/WEB-INF/jsp/editPeople.jsp"),
    		})
    public class PeopleAction {
    	List<People> ps;
    	@Autowired
    	PeopleService peopleService;
    	People people;
    	Page page;
    	String keyword;
    	@Action("listPeople")
    	public String list(){
    		if(page==null)
    			page=new Page();
    		int total=peopleService.getTotal();
    		System.out.println(total);
    		page.setTotal(total);
    		ps=peopleService.listByPage(page);
    		
    		return "listPeople";
    	}
    	@Action("addPeople")
    	public String add(){
    		peopleService.add(people);
    		return "listPeopleAction";
    	}
    	@Action("deletePeople")
    	public String delete(){
    		System.out.println("删除");
    		peopleService.delete(people);
    		return "listPeopleAction";
    	}
    	@Action("editPeople")
    	public String edit(){
    		people=peopleService.get(people.getId());
    		return "editPeople";
    	}
    	@Action("updatePeople")
    	public String update(){
    		peopleService.update(people);
    		return "listPeopleAction";
    	}
    	@Action("searchPeople")
    	public String search(){
    		ps=peopleService.search(keyword);
    		int total=ps.size();
    		System.out.println("total"+total);
    		if(page==null)
    			page=new Page();
    		page.setTotal(total);
    		for(int i=0;i<ps.size();i++)
    			System.out.println(ps.get(i));
    		return "listPeople";
    	}
    	public String getKeyword() {
    		return keyword;
    	}
    
    	public void setKeyword(String keyword) {
    		this.keyword = keyword;
    	}
    
    	/***setter and getter***/
    	
    }

再来为PeopleServiceImpl 添加注解

1. 使用@Service 为 PeopleServiceImpl添加注解  
2. 使用@Autowired自动装配peopleDAO

就只是这两个地方修改

![20181212110304390.png][]

1. 使用Repository 为PeopleDAOImpl 添加注解  
2. 重写setSessionFactory方法，并使用@Resource(name="sf")对其注解，以接受sessionFactory注入( 在 applicationContext.xml中sessionFactory所取得id是sf)  
为什么要重写？  
虽然PeopleDAOImpl 继承了HibernateTemplate ，有setSessionFactory方法，但是HibernateTemplate 中的setSessionFactory方法，并没有被注解，所以就不会被注入sf, 因此需要在这里重写这个方法。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 2][]

为People添加注解

1. 使用@Entity 为 People 添加注解  
2. @Table 指定对应表名  
3. @id 表明主键  
4. @GeneratedValue(strategy = GenerationType.IDENTITY) 使用自增长策略  
5. @Column 指明属性对应的数据库中的字段名（当属性名和字段名一样时，会自动匹配，可以不写）

package com.zdxh.pojo;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;
    
    @Entity
    @Table(name="people")
    public class People {
    	private int id;
    	private String name;
    	private String sex;
    	private String phone;
    	private String address;
    	@Column(name="sex")
    	public String getSex() {
    		return sex;
    	}
    	public void setSex(String sex) {
    		this.sex = sex;
    	}
    	@Column(name="phone")
    	public String getPhone() {
    		return phone;
    	}
    	public void setPhone(String phone) {
    		this.phone = phone;
    	}
    	@Column(name="address")
    	public String getAddress() {
    		return address;
    	}
    	public void setAddress(String address) {
    		this.address = address;
    	}
    	
    	@Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Column(name = "id") 
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	@Column(name="name")
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	@Override
    	public String toString() {
    		return "Category [id=" + id + ", name=" + name + ", sex=" + sex + ", phone=" + phone + ", address=" + address
    				+ "]";
    	}
    	
    	
    }

完成之后，启动tomcat，访问[http://127.0.0.1:8080/ssh/listP][http_127.0.0.1_8080_ssh_listP]eople

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 3][]

没问题，就完成了注解开发

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70]: /images/20220405/8c4987a50e4342f38ba6846816f80e28.png
[20181212104641124.png]: /images/20220405/769d11552fb444cfbea4e5ab624c96e5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 1]: /images/20220405/404198e5f6e14f7fb6571358ee763f27.png
[2018121210555953.png]: /images/20220405/a61d5dd627c9417fb53332439920aea8.png
[20181212110304390.png]: /images/20220405/92882d6a3b72475ab4a24e1979002db0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 2]: /images/20220405/ec39f133486b4124a7d557680f69bbad.png
[http_127.0.0.1_8080_ssh_listP]: http://127.0.0.1:8080/ssh/listProduct
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTg2Njk2MA_size_16_color_FFFFFF_t_70 3]: /images/20220405/ab0ff2fe4dc745b5baa4de50f28cb9dc.png