spring异常处理实例(登录例子)
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给出一个spring异常处理的简单例子:
spring配置文件Config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass">
<value>
org.springframework.web.servlet.view.JstlView
</value>
</property>
<property name="prefix">
<value>/WEB-INF/view/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename"><value>messages</value></property>
</bean>
<bean id="exceptionResolver"
class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="defaultErrorView">
<value>failure</value>
</property>
<property name="exceptionMappings">
<props>
<prop key="java.sql.SQLException">showDBError</prop>
<prop key="java.lang.RuntimeException">showError</prop>
</props>
</property>
</bean>
<bean id="RegisterValidator"
class="net.xiaxin.validator.RegisterValidator"/>
<bean id="RegisterAction"
class="net.xiaxin.action.RegisterAction">
<property name="commandClass">
<value>net.xiaxin.reqbean.RegisterInfo</value>
</property>
<property name="validator">
<ref local="RegisterValidator"/>
</property>
<property name="formView">
<value>register</value>
</property>
<property name="successView">
<value>RegisterSuccess</value>
</property>
</bean>
<bean id="freemarkerConfig"
class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
<property name="templateLoaderPath">
<value>WEB-INF/view/</value>
</property>
</bean>
<bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/login.do">LoginAction</prop>
<prop key="/register.do">RegisterAction</prop>
</props>
</property>
</bean>
<bean id="LoginAction"
class="net.xiaxin.action.LoginAction">
<property name="commandClass">
<value>net.xiaxin.action.LoginInfo</value>
</property>
<property name="fail_view">
<value>loginfail</value>
</property>
<property name="success_view">
<value>main</value>
</property>
</bean>
</beans>
登录测试代码:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<form method="post" action="login.do">
<p align="center">登录</p>
<br>
用户名:
<input type="text" name="username">
<br>
密 码:
<input type="password" name="password">
<br>
<p>
<input type="submit" value="提交" name="B1">
<input type="reset" value="重置" name="B2">
</p>
</form>
</body>
</html>loginInfo代码
public class LoginInfo ...{
private String username;
private String password;
public String getUsername() ...{
return username;
}
public void setUsername(String username) ...{
this.username = username;
}
public String getPassword() ...{
return password;
}
public void setPassword(String password) ...{
this.password = password;
}
}
显示错误页面:showDBError.jsp
<%...@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<%...@ page import="java.lang.Exception" %>
<%...@ page import="java.io.PrintWriter" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Insert title here</title>
</head>
<body>
<%...Exception ex=(Exception)request.getAttribute("exception");%>
<H2>Exception: <%=ex%></H2>
<%...ex.printStackTrace(new java.io.PrintWriter(out));%>
</body>
</html>
LoginAction代码public class LoginAction extends SimpleFormController...{
private String fail_view;
private String success_view;
protected ModelAndView onSubmit(Object cmd,BindException ex)throws Exception...{
LoginInfo loginInfo=(LoginInfo)cmd;
if(login(loginInfo)==0)...{
HashMap result_map=new HashMap();
result_map.put("logininfo", loginInfo);
List msgList=new LinkedList();
msgList.add("msg1");
msgList.add("msg2");
msgList.add("msg3");
result_map.put("messages", msgList);
return new ModelAndView(this.getSuccess_view(),result_map);
}else...{
SQLException e=new SQLException("this is a exception");
throw e;
// return new ModelAndView(this.getFail_view());
}
}
private int login(LoginInfo loginInfo)...{
if("oscar".equalsIgnoreCase(loginInfo.getUsername())&&"123456".equals(loginInfo.getPassword()))...{
return 0;
}
return 1;
}
public String getFail_view() ...{
return fail_view;
}
public void setFail_view(String fail_view) ...{
this.fail_view = fail_view;
}
public String getSuccess_view() ...{
return success_view;
}
public void setSuccess_view(String success_view) ...{
this.success_view = success_view;
}
}
spring配置文件Config.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass"> <value> org.springframework.web.servlet.view.JstlView </value> </property> <property name="prefix"> <value>/WEB-INF/view/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean> <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename"><value>messages</value></property> </bean> <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="defaultErrorView"> <value>failure</value> </property> <property name="exceptionMappings"> <props> <prop key="java.sql.SQLException">showDBError</prop> <prop key="java.lang.RuntimeException">showError</prop> </props> </property> </bean> <bean id="RegisterValidator" class="net.xiaxin.validator.RegisterValidator"/> <bean id="RegisterAction" class="net.xiaxin.action.RegisterAction"> <property name="commandClass"> <value>net.xiaxin.reqbean.RegisterInfo</value> </property> <property name="validator"> <ref local="RegisterValidator"/> </property> <property name="formView"> <value>register</value> </property> <property name="successView"> <value>RegisterSuccess</value> </property> </bean> <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <property name="templateLoaderPath"> <value>WEB-INF/view/</value> </property> </bean> <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/login.do">LoginAction</prop> <prop key="/register.do">RegisterAction</prop> </props> </property> </bean> <bean id="LoginAction" class="net.xiaxin.action.LoginAction"> <property name="commandClass"> <value>net.xiaxin.action.LoginInfo</value> </property> <property name="fail_view"> <value>loginfail</value> </property> <property name="success_view"> <value>main</value> </property> </bean></beans><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>Insert title here</title></head><body> <form method="post" action="login.do"> <p align="center">登录</p> <br> 用户名: <input type="text" name="username"> <br> 密 码: <input type="password" name="password"> <br> <p> <input type="submit" value="提交" name="B1"> <input type="reset" value="重置" name="B2"> </p> </form></body></html>public class LoginInfo ...{ private String username; private String password; public String getUsername() ...{ return username; } public void setUsername(String username) ...{ this.username = username; } public String getPassword() ...{ return password; } public void setPassword(String password) ...{ this.password = password; }}显示错误页面:showDBError.jsp
<%...@ page language="java" contentType="text/html; charset=gb2312" pageEncoding="gb2312"%><%...@ page import="java.lang.Exception" %><%...@ page import="java.io.PrintWriter" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>Insert title here</title></head><body><%...Exception ex=(Exception)request.getAttribute("exception");%><H2>Exception: <%=ex%></H2><%...ex.printStackTrace(new java.io.PrintWriter(out));%></body></html>LoginAction代码
public class LoginAction extends SimpleFormController...{ private String fail_view; private String success_view; protected ModelAndView onSubmit(Object cmd,BindException ex)throws Exception...{ LoginInfo loginInfo=(LoginInfo)cmd; if(login(loginInfo)==0)...{ HashMap result_map=new HashMap(); result_map.put("logininfo", loginInfo); List msgList=new LinkedList(); msgList.add("msg1"); msgList.add("msg2"); msgList.add("msg3"); result_map.put("messages", msgList); return new ModelAndView(this.getSuccess_view(),result_map); }else...{ SQLException e=new SQLException("this is a exception"); throw e;// return new ModelAndView(this.getFail_view()); } } private int login(LoginInfo loginInfo)...{ if("oscar".equalsIgnoreCase(loginInfo.getUsername())&&"123456".equals(loginInfo.getPassword()))...{ return 0; } return 1; } public String getFail_view() ...{ return fail_view; } public void setFail_view(String fail_view) ...{ this.fail_view = fail_view; } public String getSuccess_view() ...{ return success_view; } public void setSuccess_view(String success_view) ...{ this.success_view = success_view; }}
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