标签：文件下载 spring oid bash nbsp mp3 问题： file 添加
1.文件下载
用ResponseEntity<byte[]> 返回值完成文件下载
具体参见本博客之前的《文件上传下载》
@RequestMapping(value="/testResponseEntity")
public ResponseEntity<byte[]> testResponseEntity(HttpServletRequest request) throws Exception{
ServletContext servletContext = request.getServletContext();
String fileName = "风吹麦浪.mp3";
String realPath = servletContext.getRealPath("/WEB-INF/"+fileName);
InputStream in = new FileInputStream(new File(realPath));
byte[] body = new byte[in.available()];
in.read(body);
MultiValueMap<String, String> headers = new HttpHeaders();
fileName = new String(fileName.getBytes("gbk"),"iso8859-1");
headers.set("Content-Disposition", "attachment;folename="+fileName);
HttpStatus statusCode = HttpStatus.OK;
ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, statusCode);
in.close();
return response;
}
2.自定义拦截器
public class MyInterceptor implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("1-preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("1-postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("1-afterCompletion");
}
}
三个方法
2）.在springmvc配置文件中配置相对应的拦截器
<mvc:interceptors>
<!--配置自定义拦截器 ，MyFilter都拦截 -->
<bean class="com.neuedu.springmvc.filter.MyFilter"></bean>
</mvc:interceptors>
若有多个拦截器
<mvc:interceptors> <bean class="com.neuedu.springmvc.interceptor.MyInterceptor"></bean> <mvc:interceptor> <mvc:mapping path="/**"/><!-- 都拦截 --> <mvc:exclude-mapping path="/testInterceptor"/><!-- 除了这个都拦截 --> <bean class="com.neuedu.springmvc.interceptor.BInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
<mvc:mapping path=" "/> 与 <mvc:exclude-mapping path=" "/> 连用
前者代表：都拦截
后者代表：除了这个都拦截
3.SpringMVC的异常处理
@ExceptionHandler(value={ArithmeticException.class})
public ModelAndView handleException(Exception ex){
ModelAndView mv = new ModelAndView();
mv.setViewName("error");
mv.addObject("exception", ex);
return mv;
}
@ControllerAdvice
public class HangleException {
@ExceptionHandler(value={ArithmeticException.class})
public String handleException(){
System.out.println("no");
return "error";
}
}
4，基于配置的异常处理
如果希望对所有异常进行统一处理，可以使用 SimpleMappingExceptionResolver，它将异常类名映射为视图名，即发生异常时使用对应的视图报告异常
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<!-- exceptionAttribute用于指定异常对象在request域中的键 -->
<property name="exceptionAttribute" value="ex"></property>
<property name="exceptionMappings">
<props>
<!-- key:指定异常的全类名 value：出现错误后要转发到的页面，但是此处没有value属性，所以直接写，如"error"-->
<prop key="java.lang.ArithmeticException">error</prop>
</props>
</property>
</bean>
在 jsp页面写 ${exception }，会在页面显示错误信息
这是因为默认将该信息写到 request 域中
如果不想用这个 名称，可以在配置信息中添加
<property name="exceptionAttribute" value="ex"></property>
这样在 jsp 页面写 ${ex } 也会在页面显示错误信息
SpringMVC（四）-- 文件下载、自定义拦截器、异常处理
标签：文件下载 spring oid bash nbsp mp3 问题： file 添加
原文地址：http://www.cnblogs.com/lwj-0923/p/7424933.html
