Struts2.0多文件上传下载

一、文件上传

Struts2并没有提供文件上传的组件，所以想要实现上传的功能就必须通过第三方组件来实现，在Struts2引用的jar中包含了文件上传的组件，它是通过commons-fileupload.jar和commons-io.jar来实现的。这其中的处理细节不需要太懂，在使用中慢慢思考就可以做到灵活运用。

1、编写Action类

文件上传的核心实现使用的还是java的数据流io操作，上传文件时要防止文件上传重复覆盖，

文件上传操作类：

public String setFile(List<File> fileList,List<String> fileListFileName,List<String> fileListContentType) throws IOException{
String root = ServletActionContext.getServletContext().getRealPath("/upload/sample")+File.separator;//+tmpPath+File.separator;
System.out.println("root=="+root);
File f = new File(root);
if(!f.exists()){
f.mkdirs();
}
File[] files = FileUtil.listSortedFiles(f);
String path="";
for(int i = 0; i < fileList.size(); i++)
{
InputStream is = new FileInputStream(fileList.get(i));

String filename = fileListFileName.get(i);
String fileName1 = filename.substring(0,filename.lastIndexOf("."));
String fileSuffix1 = filename.substring(filename.lastIndexOf("."));
Integer fileIndex = -1;
for (File file : files) {
if(file.isDirectory())continue;
String fileName = file.getName();
String fileSuffix = "";
if(file.getName().lastIndexOf(".") > -1){
fileName = file.getName().substring(0,file.getName().lastIndexOf("."));
fileSuffix = file.getName().substring(file.getName().lastIndexOf("."));
}
if(fileName.indexOf(fileName1)==0 && fileSuffix.equals(fileSuffix1)){
if(fileName.equals(fileName1)){
if(fileIndex == -1){
filename = fileName + "-副本" + fileSuffix;
fileIndex = 0;
}
}else if(fileName.indexOf("-副本")>0){
int index = fileName.indexOf("-副本");
String num = "".equals(fileName.substring(index+3))?"0":fileName.substring(index+3);
Integer tmp = (Integer.parseInt(num)+1);
if(fileIndex < tmp){
fileIndex = tmp;
filename = fileName1 + "-副本" + tmp + fileSuffix;
}
}
}
}
OutputStream os = new FileOutputStream(new File(root, filename));//
path += ("".equals(path)?"":";")+root+filename;
byte[] buffer = new byte[500];

@SuppressWarnings("unused")
int length = 0;

while(-1 != (length = is.read(buffer, 0, buffer.length)))
{
os.write(buffer);
}

os.close();
is.close();
}
return path;
}

action调用类：

private List<File> cerFiles;
private List<String> cerFilesFileName;
private List<String> cerFilesContentType;
public String save() throws IOException{
String path1=this.setFile(cerFiles, cerFilesFileName, cerFilesContentType);
sampleCertificationInfo.setAttachmentCerPath(path1);
}

jsp页面：

<script type="text/javascript">

$(function()
{
$("#button1").click(function()
{
var html = $("<input type='file' name='cerFiles'>");
var button = $("<input type='button' name='button' value='删除'><br>");

$("#add1").append(html).append(button);

button.click(function()
{
html.remove();
button.remove();
})
})
})
</script>
<form action="sampleCertificationAction_save.action" method="post" enctype="multipart/form-data">
<input type="file" name="cerFiles">
<input type="button" value="添加" id="button1"><br>
<div id="add1"></div>
</form>

一、文件下载

Action代码：

private String fileName;
private InputStream fileInput;
public InputStream getDownloadFile()
{
return ServletActionContext.getServletContext().getResourceAsStream("upload\\sample\\"+fileName);
}
public String getFileDown(){
System.out.println("下载的文件是==="+fileName);
fileInput=ServletActionContext.getServletContext().getResourceAsStream("upload\\sample\\"+fileName);
try {
fileName = new String(fileName.getBytes(), "ISO8859-1");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if(fileInput ==  null){
return  "";
}
System.out.println("fileInput=="+fileInput);
return "success";
}
public InputStream getFileInput() {
return fileInput;
}
public void setFileInput(InputStream fileInput) {
this.fileInput = fileInput;
}

jsp页面：显示文件名

Map

<s:iterator value="#filenamesList" id="val">
<a href="sampleBaseInfoAction_getFileDown.action?fileName=<s:property value="#val"/>" target="tmp_upload_iframe"><s:property value="#val"/></a></br>
</s:iterator>
如果直接是List<String>集合存储文件名，jsp显示用以下方式：
<s:iterator value="#infoList" id="val">
<a href="sampleBaseInfoAction_getFileDown.action?fileName=<s:property value="#val"/>" target="tmp_upload_iframe"><s:property value="#val"/></a></br>
</s:iterator></td>

下载最主要的是struts-xml文件的配置：

<result name="success" type="stream">
<param name="contentType">application/octet-stream</param>
<param name="inputName">fileInput</param>
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<param name="bufferSize">4096</param>
</result>