jsf上传图片
总结下图片上传：所用的开发工具版本如下：jsf1.2+ejb3.0+jboss4.2.3
准备工作：导入有关三个文件传输的jar包：commons-io-1.3.2.jar commons-fileupload-1.2.1.jar tomahawk12-1.1.14.jar,注意此时不要添加myfaces-extension.jar包，否则会冲突。
在web.xml写好配置：在<web-app>添加一个filter结点：
<filter>
<filter-name>extensionsFilter</filter-name>
<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
<init-param>
<description>Set the size limit for uploaded files.
Format: 10 - 10 bytes
10k - 10 KB
10m - 10 MB
1g - 1 GB</description>
<param-name>uploadMaxFileSize</param-name>
<param-value>10m</param-value>
</init-param>
<init-param>
<description>Set the threshold size - files
below this limit are stored in memory, files above
this limit are stored on disk.
Format: 10 - 10 bytes
10k - 10 KB
10m - 10 MB
1g - 1 GB</description>
<param-name>uploadThresholdSize</param-name>
<param-value>1k</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>extensionsFilter</filter-name>
<url-pattern>/faces/*</url-pattern>
</filter-mapping>
第一步：在jsp页面开始出导入标签：<%@ taglib prefix="t" uri="http://myfaces.apache.org/tomahawk" %>。
并在form表单设定enctype="multipart/form-data",因为上传文件必须设定mime的值为multipart/form-data。比如我的jsp页面是这样写的：<h:form id="inputnewgoods" enctype="multipart/form-data">.关于mime和enctype的选择可以参考：为什么上传文件的表单里要加个属性enctype
然后是表单里面写上上传文件的组建：<t:inputFileUpload id="uploadfile" value="#{backingbean.upFile }"
required="true" onchange="previewImage(this)" storage="file">，关于t:inputFileUpload的其他属性及含义可以参考官网介绍t:inputFileUpload:http://myfaces.apache.org/tomahawk-project/tomahawk12/tagdoc/t_inputFileUpload.html
注意上面的onchange="previewImage(this)"中previewImage(this)是文件预览功能，用到了html5的文件API。
提交表单：<h:commandButton id="submitbutton" value="提交" action="#{backingbean.upload}"/>
第二步：建一个backing bean 我设置的backingbean的范围是session,网上有些博客说要设置成request，但是我的表单中还有级联菜单，实现级联菜单必须要用到session范围内的backingbean否则会出现异常。
代码大致如下：
......
import org.apache.myfaces.custom.fileupload.UploadedFile;
......
public class backingbean{
...
private UploadedFile upFile;
...
...
public UploadedFile getUpFile() {
return upFile;
}
public void setUpFile(UploadedFile upFile) {
this.upFile = upFile;
}
...
...
public String upload(){
try {
InputStream in = new BufferedInputStream(upFile.getInputStream());
try {
byte[] buffer = new byte[(int)upFile.getSize()];
//取得文件名
String name = upFile.getName();
//存路径
String trace = "D:\\images\\" +name;//本地测试
FileOutputStream fileOutputStream =
new FileOutputStream(trace); //这里可以把上传的文件写服务器目录，或者数据库中 ，或者赋值给name用于文件名显示
while (in.read(buffer) > 0) {
fileOutputStream.write(buffer);
}
} catch (Exception x) {
System.out.print("出错啦！！！");
FacesMessage message =
new FacesMessage(FacesMessage.SEVERITY_FATAL,
x.getClass().getName(), x.getMessage());
FacesContext.getCurrentInstance().addMessage(null, message);
}
finally {
in.close();
FacesContext facesContext = FacesContext.getCurrentInstance();
facesContext.getExternalContext().getApplicationMap().put("fileupload_bytes", upFile.getBytes());
facesContext.getExternalContext().getApplicationMap().put("fileupload_type",
upFile.getContentType());
}
System.out.println("End");
} catch (Exception x) {
System.out.print("出错啦！！！22222");
FacesMessage message =
new FacesMessage(FacesMessage.SEVERITY_FATAL,
x.getClass().getName(), x.getMessage());
FacesContext.getCurrentInstance().addMessage(null, message);
}
return null;
}
}
最后注意在face-config里面设置这个backingbean。