十二、异常处理和国际化

异常处理

index.jsp

<a href="${pageContext.request.contextPath}/GoTry">1/0=?</a>

ExceptionController

@Controller
public class ExceptionController {
    @RequestMapping("GoTry")
    public String test1(){
        int i = 1/0;
        return "/result.jsp";
    }

    /**
     * 异常优先级：
     * ArithmeticException => RuntimeException => Exception
     * 如果Exception也没有，就会去找一个类：
     */
    @ExceptionHandler(value = ArithmeticException.class)
    public String doException(Exception e){
        System.out.println(e.getMessage());
        return "/error.jsp";
    }
    @ExceptionHandler(value = RuntimeException.class)
    public String doException2(Exception e){
        System.out.println(e.getMessage());
        return "/error.jsp";
    }
    @ExceptionHandler(value = Exception.class)
    public String doException3(Exception e){
        System.out.println(e.getMessage());
        return "/error.jsp";
    }
}

error.jsp

<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>服务器回家过年了！</h1>
</body>
</html>

如果Exception也没有，就会去找一个类

@ControllerAdvice
public class ExceptionHander {
    @ExceptionHandler(value = Exception.class)
    public String doExcption(Exception e){
        System.out.println(e.getMessage());
        return "/error.jsp";
    }
}

国际化

创建国际化的资源文件

message_zh_CN.properties

welcome=欢迎
name=撩课

message_en_US.properties

welcome=welcome
name=itlike

配置springmvc.xml

<!--国际化-->
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="message"/>
</bean>

导入jstl的两个Jar包
index.jsp

<a href="${pageContext.request.contextPath}/local">测试国际化</a>

LocalController

@Controller
public class LocalController {
    @RequestMapping("local")
    public String local(){
        return "/local.jsp";
    }
}

中英文切换

index.jsp

<a href="${pageContext.request.contextPath}/local">测试国际化</a>

LocalController

@Controller
public class LocalController {
    @RequestMapping("local")
    public String local(){
        return "/local.jsp";
    }
}

local.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>local</h1>
<a href="?language=zh_CN"><fmt:message key="language.cn" /></a>
<a href="?language=en_US"><fmt:message key="language.en" /></a>
<hr>
<fmt:message key="welcome"/>
<fmt:message key="name"/>
</body>
</html>

springmvc.xml

<!--国际化-->
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="message"/>
</bean>
<!--session本地解析器-->
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"/>
<!--拦截器-->
<mvc:interceptors>
    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
        <property name="paramName" value="language"/>
    </bean>
</mvc:interceptors>

资源文件message_en_US.properties和message_zh_CN.properties同上。

一定要打开这里：

1.PNG

十二、异常处理和国际化

异常处理

国际化

中英文切换

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