struts2上传下载文件及出现的问题 struts2上传下载

程序员文章站 2022-07-12 15:59:38

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在过去的这一周里，断断续续的在做文件上传下载。把这几天遇到的坑，一一写下来，让大家能避免。

1、开发环境

Struts2.3.20+spring3.2.7+mybatis3.3.0

2、使用ajaxfileupload.js+JQuery+servlet

在上传的过程中，图片上传不上，下载文件也不完整，有可能报错。

注意在struts2要使用Servlet

Web.xml中

<servlet-mapping>

<servlet-name>XXServlet</servlet-name>

<url-pattern>/XXServlet.servlet</url-pattern>

</servlet-mapping>

页面调用要写成

document.myform.action= "${pageContext.request.contextPath}/XXServlet.servlet";

document.myform.submit();

上传不成功的原因，有可能是struts2拦截不到文件，也有可能是组件不兼容，我在IE7下测试没有问题，但是在IE11下有问题。

百度了N次，好多方法都试过了，结论不行。既然不行，那么老老实实的用struts2自带的上传下载组件吧。

3、上传主页面

</td>

4、 UploadFiles.jsp页面部分代码

function testUpload(){

var excelpath = document.forms[0].upload.value;

var url = '${pageContext.request.contextPath}/modiProImages';

if(excelpath!=null && excelpath!=''){

var ss = excelpath.split('.');

var fileType = ss[ss.length-1];

if(fileType=='jpg'||fileType=='JPG'||fileType=='pdf' || fileType=='PDF'){

document.all.test.action = url;

document.all.test.submit();

}else{

alert("只允许上传.jpg和.pdf类型文件!");

document.all.test.reset();

return ;

}

}else{

alert("请选择上传文件");

return ;

}

<tr>

</td>

</tr>

</table>

</form>

5、在struts.xml注册

<result name="success">/Tksm/proplan/UploadFiles.jsp</result>

<result name="error">/WEB-INF/index/error.jsp</result>

<result name="input">/Tksm/proplan/UploadFiles.jsp</result>

</action>

6、 ProInfoAction.java

private File upload;

private String uploadFileName;

private String uploadContentType;

生成setter/getter方法

@SuppressWarnings("unchecked")

public String modiProImages() throws Exception {

request = ServletActionContext.getRequest();

session = request.getSession(true);

Profiles profiles = new Profiles();

File fileinit;

String tmpPath = "D:\\modiimages";

fileinit = new File(tmpPath);

if (!fileinit.isDirectory()){

fileinit.mkdir();

}

String savePath = "modiimages/";

String message = "";

try {

File f = this.getUpload();

//System.out.println("name=="+this.getUploadFileName());

FileInputStream inputstr = new FileInputStream(f);

String wjmc = this.getUploadFileName();

int index = wjmc.lastIndexOf(".");

wjmc = wjmc.substring(index + 1, wjmc.length());

String filename = pronum+"_"+LineNbr+"."+wjmc;

File uploadFile = new File(tmpPath + "/" + filename);

FileOutputStream outputstr = new FileOutputStream(uploadFile);

byte[] buf = new byte[1024];

int length = 0;

while ((length = inputstr.read(buf)) != -1) {

outputstr.write(buf, 0, length);

}

outputstr.flush();

outputstr.close();

inputstr.close();

message = "文件上传成功!";

return "success";

}catch(Exception e){

e.printStackTrace();

message = "文件上传失败";

return "input";

}

7、配置tomcat虚拟目录

在Tomcat x.x\conf\Catalina\localhost文件夹下新建工程同名.xml文件

如果打算是双级虚拟目录，或者多级虚拟目录，写成aa#bb#cc.xml

需要手动在D盘新建modiimages文件夹。

<?xml version='1.0' encoding='utf-8'?>

</Context>

8、下载文件

function downFile(filename){

var href="${pageContext.request.contextPath}/downCustFile?fileName="+filename;

document.forms[0].action=href;

document.forms[0].submit();

}

</a>

</td>

9、下载struts2-sunspoter-stream-1.0.jar

10、 Struts.xml中注册方法

<result-types>

<result-type name="streamx" class="com.sunspoter.lib.web.struts2.dispatcher.StreamResultX" />

</result-types>

点击下载文件时，点击取消会报错：

严重: Servlet.service() for servlet jsp threw exception

java.lang.IllegalStateException: getOutputStream() has already been called for this response

这是一个struts2的bug

<param name="inputName">inputStream</param>

<param name="contentDisposition">attachment; filename=${fileName}</param>

<param name="contentType">application/octet-stream;charset=ISO8859-1</param>

</result>

<result name="error">/WEB-INF/index/error.jsp</result>

</action>

11、 ProInfoAction

private String fileName;

private InputStream inputStream;

生成getter/setter方法

public InputStream getInputStream(){

request = ServletActionContext.getRequest();

String filepath = "/modiimages/"+this.getFileName();

//System.out.println("filepath="+"/"+filepath);

try {

String fullpath = request.getRequestURL().toString();

int index = fullpath.lastIndexOf("/");

fullpath = fullpath.substring(0, index + 1)+filepath;

URL url = new URL(fullpath);

URLConnection conn = url.openConnection();

inputStream = conn.getInputStream();

//System.out.println("inputStream=="+inputStream);

return inputStream;

} catch (MalformedURLException e) {

//e.printStackTrace();

} catch (IOException e) {

//e.printStackTrace();

}

return null;

使用struts2自带的上传

如果使用这段代码，会报如下错误

StreamResultX : Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the <param name="inputName"> tag specified for this action.

打印

inputStream===null

说明没有找到文件，文件输入流为空

request = ServletActionContext.getRequest();

session = request.getSession(true);

String fname = this.getFileName();

String filepath = "/modiimages/"+fname;

String fullpath = request.getRequestURL().toString();

int index = fullpath.lastIndexOf("/");

fullpath = fullpath.substring(0, index + 1)+filepath;

inputStream = ServletActionContext.getServletContext().getResourceAsStream(fullpath);

System.out.println("inputStream==="+inputStream);

fileName = encodingFileName(fname);

return inputStream;*/

}

public String downCustFile() throws Exception {

return "success";

}

这一篇文章，参考了

https://blog.csdn.net/xiangchengguan/article/details/39860065

http://zfc.iteye.com/blog/1050009

https://www.cnblogs.com/lcngu/p/5094159.html

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