國際化
國際化(internationalization) 簡稱i18n,是一種讓軟體在開發階段就支援多種語言的技術
springmvc實作動态國際化(中英雙語)
1. 提供中英雙語資源檔案( i18n_en_US.properties、 i18n_zh_CN.properties)
2. 通過ResourceBundleMessageSource加載資源檔案(basenames屬性)
<!--1) 配置國際化資源檔案 -->
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basenames">
<list>
<value>i18n</value>
</list>
</property>
</bean>
注:1、必須叫messageSource
2、可在開發階段使用ReloadableResourceBundleMessageSource它能自動重新加載資源檔案
3. 指定springmvc的語言區域解析器,由它來确定使用哪個語言
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"></bean>
4.配置國際化操作攔截器,如果采用基于(Session/Cookie)則必需配置
<mvc:interceptors>
<bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
</mvc:interceptors>
5.5 通過标簽輸出内容,而非直接輸出内容
配置國際化操作攔截器,如果采用基于(Session/Cookie)則必需配置
5.5 springmvc的message标簽輸出
<%@ taglib prefix="t" uri="http://www.springframework.org/tags" %>
<t:message code="title"/>
5.5 jstl的fmt标簽庫的标簽輸出
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<t:message code="title"/>
注:1、為什麼在index.jsp使用<t:message code="user_name"/>會報錯
原因是在web.xml中配置的DispatcherServlet的url-pattern為“/”,不會比對通路.jsp的url,
是以直接通路首頁并不會經過DispatcherServlet,導緻無法讀取到資源檔案
解決方案:首頁轉發到/WEB-INF/jsp/login.jsp即可
2、切換語言的關鍵代碼(系統必須使用SessionLocaleResolver解析器)
session.setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME,Locale.CHINA)
5.6 背景代碼擷取國際化資訊
@RequestMapping("/i18n")
public String i18n(String state, HttpSession session){
if("English".equals(state)){
session.setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, Locale.US);
}else{
session.setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, Locale.CHINA);
}
return "i18n";
}
注:需修改pom.xml将國際化資源檔案輸出到target檔案夾
<resource>
<directory>src/main/resources</directory>
<includes>
<!--<include>jdbc.properties</include>-->
<include>*.properties</include>
<include>*.xml</include>
</includes>
</resource>
springmvc的檔案上傳
簡單步驟及代碼
1.添加檔案上傳相關依賴
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
2. 配置檔案上傳解析器(CommonsMultipartResolver)
在 springmvc-servlet.xml 中配置
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 必須和使用者JSP 的pageEncoding屬性一緻,以便正确解析表單的内容 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 檔案最大大小(位元組) 1024*1024*50=50M-->
<property name="maxUploadSize" value="52428800"></property>
<!--resolveLazily屬性啟用是為了推遲檔案解析,以便捕獲檔案大小異常-->
<property name="resolveLazily" value="true"/>
</bean>
3 表單送出方式為method="post" enctype="multipart/form-data"
<form action="${pageContext.request.contextPath }/student/upload/${sid}" enctype="multipart/form-data" method="post">
<input type="hidden" value="${sid}" name="sid"/>
<input type="file" name="file">
<input type="submit" value="上傳">
</form>
4. 檔案項用spring提供的MultipartFile進行接收
5. IO流讀寫檔案
@RequestMapping("/upload/{sid}")
public String upload(MultipartFile file,HttpServletRequest request,@PathVariable("sid") Integer sid){
String fileName = file.getOriginalFilename();
String realPath = request.getServletContext().getRealPath(serverDir + fileName);
Student student = new Student();
student.setSid(sid);
student.setPhotoname(fileName);
//圖檔的類型
student.setPhototype(file.getContentType());
studentService.updateByPrimaryKeySelective(student);
try {
FileUtils.copyInputStreamToFile(file.getInputStream(),new File(realPath));
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:/student/list";
}
另附下載下傳
@RequestMapping("/download/{photoname}")
public String success(MultipartFile file, HttpServletRequest request, HttpServletResponse response, @PathVariable("photoname") String photoname){
System.out.println(photoname);
String name = photoname+".jpg";
String type = "image/jpeg";
String realPath = request.getServletContext().getRealPath(serverDir + name);
response.setContentType(type);
response.setHeader("Content-Disposition","attachment;filename=" + name);//檔案名
/*
* 從伺服器拿圖檔到本地
* 源:伺服器
* 目的:jsp輸出圖檔
*/
File serverFile = new File(realPath);
try {
//下載下傳效率低
// FileUtils.copyFile(serverFile, response.getOutputStream());
BufferedInputStream in = new BufferedInputStream(new FileInputStream(serverFile));
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
copyBufferedStream(in, out);
} catch (IOException e) {
e.printStackTrace();
}
return "success";
}
/**
* 提高下載下傳效率
* @param in
* @param out
*/
private void copyBufferedStream(BufferedInputStream in, BufferedOutputStream out) {
byte[] bbuf = new byte[1024];
int len = 0;
try {
while((len = in.read(bbuf))!=-1) {
out.write(bbuf, 0, len);
}
in.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}