springMVC笔记二详解编程语言

第十四章 springmvc快速入门（注解版本）

1）springmvc快速入门（传统版）

步一：创建springmvc-day02这么一个web应用

步二：导入springioc，springweb和springmvc相关的jar包

——————————————————springWEB模块

org.springframework.web-3.0.5.RELEASE.jar

org.springframework.web.servlet-3.0.5.RELEASE.jar（mvc专用）

——————————————————springIOC模块

org.springframework.asm-3.0.5.RELEASE.jar

org.springframework.beans-3.0.5.RELEASE.jar

org.springframework.context-3.0.5.RELEASE.jar

org.springframework.core-3.0.5.RELEASE.jar

org.springframework.expression-3.0.5.RELEASE.jar

步三：在/WEB-INF/下创建web.xml文件

<servlet> 
    <servlet-name>DispatcherServlet</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet 
    </servlet-class> 
    <init-param> 
        <param-name>contextConfigLocation</param-name> 
        <param-value>classpath:spring.xml</param-value> 
    </init-param> 
</servlet> 
<servlet-mapping> 
    <servlet-name>DispatcherServlet</servlet-name> 
    <url-pattern>*.action</url-pattern> 
</servlet-mapping>

步四：创建HelloAction.java控制器类

@Controller 
public class HelloAction { 
    @RequestMapping(value = "/hello") 
    public String helloMethod(Model model) throws Exception { 
        System.out.println("HelloAction::helloMethod()"); 
        model.addAttribute("message", "这是我的第二个springmvc应用程序"); 
        return "/success.jsp"; 
    } 
}

步五：在/WebRoot/下创建success.jsp

<%@ page language="java" pageEncoding="UTF-8"%> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
<head> 
<title>这是我的第二个springmvc应用程序</title> 
</head> 
<body> 
    success.jsp 
    <br /> ${message} 
</body> 
</html>

步六：在/src/目录下创建spring.xml配置文件

　　 <!-- Action控制器 --> 
    <context:component-scan base-package="cn.itcast.javaee.springmvc.helloannotation" /> 
    <!-- 基于注解的映射器(可选) --> 
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> 
 
    <!-- 基于注解的适配器(可选) --> 
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> 
 
    <!-- 视图解析器(可选) --> 
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" />

步七：部署web应用到tomcat中，通过浏览器访问如下URL：

http://127.0.0.1:8080/springmvc-day02/hello.action

第十五章一个Action中，可以写多个类似的业务控制方法

1）通过模块根路径 + 功能子路径 = 访问模块下子功能的路径

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/add") 
    public String add(Model model) throws Exception { 
        System.out.println("HelloAction::add()"); 
        model.addAttribute("message", "增加用户"); 
        return "/success.jsp"; 
    } 
 
    @RequestMapping(value = "/find") 
    public String find(Model model) throws Exception { 
        System.out.println("HelloAction::find()"); 
        model.addAttribute("message", "查询用户"); 
        return "/success.jsp"; 
    } 
}

增加用户：http://127.0.0.1:8080/myspringmvc-day02/user/add.action

查询用户：http://127.0.0.1:8080/myspringmvc-day02/user/find.action

第十六章在业务控制方法中写入普通变量收集参数

1）可以在业务控制方法中，以参数形式收集客户端参数，springmvc采用方法参数形式的

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/add") 
    public String add(Model model, int id, String name, Double sal) throws Exception { 
        System.out.println("HelloAction::add()"); 
        System.out.println(id + ":" + name + ":" + sal); 
        model.addAttribute("message", "增加用户"); 
        return "/success.jsp"; 
    } 
}

http://127.0.0.1:8080/myspringmvc-day02/user/add.action?id=1&name=zhaojun&sal=5000

第十七章限定某个业务控制方法，只允许GET或POST请求方式访问

1）可以在业务控制方法前，指明该业务控制方法只能接收GET或POST的请求

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/add", method = RequestMethod.POST) 
    public String add(Model model, int id, String name, double sal) throws Exception { 
        System.out.println("HelloAction::add()::POST"); 
        System.out.println(id + ":" + name + ":" + sal); 
        model.addAttribute("message", "增加用户"); 
        return "/success.jsp"; 
    } 
}

如果不书写method=RequestMethod.POST的话，GET和POST请求都支持

第十八章在业务控制方法中写入Request，Response等传统web参数

1）可以在业务控制方法中书写传统web参数，这种方式我们不提倡，耦合了

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/add", method = RequestMethod.POST) 
    public void add(HttpServletRequest request, HttpServletResponse response) throws Exception { 
        System.out.println("HelloAction::add()::POST"); 
        int id = Integer.parseInt(request.getParameter("id")); 
        String name = request.getParameter("name"); 
        double sal = Double.parseDouble(request.getParameter("sal")); 
        System.out.println(id + ":" + name + ":" + sal); 
        request.getSession().setAttribute("id", id); 
        request.getSession().setAttribute("name", name); 
        request.getSession().setAttribute("sal", sal); 
        response.sendRedirect(request.getContextPath() + "/register.jsp"); 
    } 
}

第十九章在业务控制方法中写入模型变量收集参数，且使用@InitBind来解决字符串转日期类型

1）在默认情况下，springmvc不能将String类型转成java.util.Date类型，所有我们只能在Action

中自定义类型转换器

<form action="${pageContext.request.contextPath}/user/add.action" method="POST"> 
    编号：<input type="text" name="id" value="${id}" /><br /> 
    姓名：<input type="text" name="name" value="${name}" /><br /> 
    薪水：<input type="text" name="sal" value="${sal}" /><br /> 
    入职时间：<input type="text" name="hiredate" 
        value='<fmt:formatDate value="${hiredate}" type="date"/>' /><br /> 
    <input type="submit" value="注册" /> 
</form>

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @InitBinder 
    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception { 
        binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true)); 
    } 
 
    @RequestMapping(value = "/add", method = RequestMethod.POST) 
    public String add(int id, String name, double sal, Date hiredate, Model model) throws Exception { 
        System.out.println("HelloAction::add()::POST"); 
        model.addAttribute("id", id); 
        model.addAttribute("name", name); 
        model.addAttribute("sal", sal); 
        model.addAttribute("hiredate", hiredate); 
        return "/register.jsp"; 
    } 
}

第二十章在业务控制方法中写入User，Admin多个模型收集参数

1）可以在业务控制方法中书写1个模型来收集客户端的参数

2）模型中的属性名必须和客户端参数名一一对应

3）这里说的模型不是Model对象，Model是向视图中封装的数据

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @InitBinder 
    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception { 
        binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true)); 
    } 
 
    @RequestMapping(value = "/add", method = RequestMethod.POST) 
    public String add(User user, Model model) throws Exception { 
        System.out.println("HelloAction::add()::POST"); 
        model.addAttribute("user", user); 
        return "/register.jsp"; 
    } 
}

第二十一章在业务控制方法中写入包装User的模型来收集参数

可以在业务控制方法中书写0个或多个模型来收集客户端的参数

1）如果多个模型中有相同的属性时，可以用user.name或admin.name来收集客户端参数

2）用一个新的模型将User和Admin再封装一次

User.java

public class User { 
    private Integer id; 
    private String name; 
    private Double sal; 
    private Date hiredate; 
 
    public User() { 
    } 
 
    public Integer getId() { 
        return id; 
    } 
 
    public void setId(Integer id) { 
        this.id = id; 
    } 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public Double getSal() { 
        return sal; 
    } 
 
    public void setSal(Double sal) { 
        this.sal = sal; 
    } 
 
    public Date getHiredate() { 
        return hiredate; 
    } 
 
    public void setHiredate(Date hiredate) { 
        this.hiredate = hiredate; 
    } 
 
    @Override 
    public String toString() { 
        return this.id + ":" + this.name + ":" + this.sal + ":" + this.hiredate; 
    } 
}

Bean.java

public class Bean { 
    private User user; 
    private Admin admin; 
 
    public Bean() { 
    } 
 
    public User getUser() { 
        return user; 
    } 
 
    public void setUser(User user) { 
        this.user = user; 
    } 
 
    public Admin getAdmin() { 
        return admin; 
    } 
 
    public void setAdmin(Admin admin) { 
        this.admin = admin; 
    } 
}

PersonAction.java

@Controller 
@RequestMapping(value = "/person") 
public class PersonAction { 
    @InitBinder 
    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception { 
        binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true)); 
    } 
 
    @RequestMapping(value = "/add", method = RequestMethod.POST) 
    public String add(Bean bean, Model model) throws Exception { 
        System.out.println(bean.getUser()); 
        System.out.println(bean.getAdmin()); 
        System.out.println("PersonAction::add()::POST"); 
        model.addAttribute("bean", bean); 
        return "/register.jsp"; 
    } 
}

普通用户 
<form action="${pageContext.request.contextPath}/person/add.action" method="POST"> 
    编号：<input type="text" name="user.id" value="${bean.user.id}"/><br/> 
    姓名：<input type="text" name="user.name" value="${bean.user.name}"/><br/> 
    薪水：<input type="text" name="user.sal" value="${bean.user.sal}"/><br/> 
    入职时间：<input type="text" name="user.hiredate" value='<fmt:formatDate value="${bean.user.hiredate}" type="both" />'/><br/> 
    <input type="submit" value="注册"/> 
</form>

第二十二章在业务控制方法中收集数组参数

批量删除用户

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/delete") 
    public String deleteMethod(int[] ids, Model model) throws Exception { 
        System.out.println("UserAction::deleteMethod()"); 
        System.out.println("需要删除的id为："); 
        for (int id : ids) { 
            System.out.print(id + " "); 
        } 
        model.addAttribute("message", "批量删除成功"); 
        return "/success.jsp"; 
    } 
}

第二十三章在业务控制方法中收集List<JavaBean>参数

批量注册用户

UserAction.java

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/addAll") 
    public String addAll(Bean bean, Model model) throws Exception { 
        for (User user : bean.getUserList()) { 
            System.out.println(user.getName() + ":" + user.getGender()); 
        } 
        model.addAttribute("message", "批量增加用户成功"); 
        return "/success.jsp"; 
    } 
}

Bean.java

public class Bean { 
    private List<User> userList = new ArrayList<User>(); 
 
    public Bean() { 
    } 
 
    public List<User> getUserList() { 
        return userList; 
    } 
 
    public void setUserList(List<User> userList) { 
        this.userList = userList; 
    } 
}

registerAll.jsp

<form action="${pageContext.request.contextPath}/user/addAll.action" method="POST">  
    姓名：<input type="text" name="userList[0].name" value="哈哈"/> 
    性别：<input type="text" name="userList[0].gender" value="男"/> 
    <hr/> 
      
    姓名：<input type="text" name="userList[1].name" value="呵呵"/> 
    性别：<input type="text" name="userList[1].gender" value="男"/> 
    <hr/> 
     
    姓名：<input type="text" name="userList[2].name" value="嘻嘻"/> 
    性别：<input type="text" name="userList[2].gender" value="女"/> 
    <hr/> 
     
    <input type="submit" value="批量注册"/> 
</form>

第二十四章结果的转发和重定向

1）在转发情况下，共享request域对象，会将参数从第一个业务控制方法传入第二个业务控制方法，

反之，重定向则不行

删除id=10号的用户，再查询用户

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
 
    @RequestMapping(value = "/delete") 
    public String delete(int id) throws Exception { 
        System.out.println("删除用户->" + id); 
        // 转发到find() 
        return "forward:/user/find.action"; 
        // 重定向到find() 
        // return "redirect:/user/find.action"; 
    } 
 
    @RequestMapping(value = "/find") 
    public String find(int id) throws Exception { 
        System.out.println("查询用户->" + id); 
        return "/success.jsp"; 
    } 
 
}

第二十五章异步发送表单数据到JavaBean，并响应JSON文本返回

1）提交表单后，将JavaBean信息以JSON文本形式返回到浏览器

bean2json.jsp

<form> 
编号：<input type="text" name="id" value="1"/><br/> 
姓名：<input type="text" name="name" value="哈哈"/> <br /> 
薪水：<input type="text" name="sal" value="5000" /><br /> 
<input type="button" value="异步提交注册" /> 
</form> 
 
<script type="text/javascript"> 
    $(":button").click(function() { 
        var url = "${pageContext.request.contextPath}/user/add.action"; 
        var sendData = { 
            "id" : 1, 
            "name" : "哈哈", 
            "sal" : 5000 
        }; 
        $.post(url, sendData, function(backData, textStatus, ajax) { 
            alert(ajax.responseText); 
        }); 
    }); 
</script>

User.java

public class User { 
    private Integer id; 
    private String name; 
    private Double sal; 
    public User() { 
    } 
 
    public Integer getId() { 
        return id; 
    } 
 
    public void setId(Integer id) { 
        this.id = id; 
    } 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public Double getSal() { 
        return sal; 
    } 
 
    public void setSal(Double sal) { 
        this.sal = sal; 
    } 
}

UserAction.java

@Controller 
@RequestMapping(value = "/user") 
public class UserAction { 
    @RequestMapping(value = "/add") 
    public @ResponseBody User add(User user) throws Exception { 
        System.out.println(user.getId() + ":" + user.getName() + ":" + user.getSal()); 
        return user; 
    } 
}

spring.xml

<!-- Action控制器 --> 
<context:component-scan base-package="cn.itcast.javaee.springmvc.app25" /> 
 
<!-- 配适器 --> 
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 
    <property name="messageConverters"> 
         <list> 
            <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" /> 
        </list> 
    </property> 
</bean>

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/11714.html

springMVC笔记二详解编程语言

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