java的下载代码 java程序下载
javaweb下载的代码怎么写
这个是用spSmartUpload实现的 使用的时候导入smartupload的jar包
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jsp页面
body
%
File f = new File("e:\\abc\\");
String[] fnames = f.list();
for(int i = 0; i fnames.length; i++){
%
a href="down?fname=%=fnames[i]%"%=fnames[i]%/abr
%}%
/body
servlet中
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String fname = new String(request.getParameter("fname").getBytes(
"iso-8859-1"));
SmartUpload su = new SmartUpload();
su.initialize(getServletConfig(), request, response);// 初始化
try {
su.setContentDisposition(null);//出现下载提示
su.downloadFile("e:\\abc\\" + fname);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
java下载方面的代码
你的这段代码有两处让人疑惑。其一、File()这个构造函数，自已查下API
其二、FileOutputStream，FileOutputStream(String name)创建一个向具有指定名称的文件中写入数据的输出文件流。它只是创建了一个输出流，其中没有具体的值，那么这个值来自哪呢，其就来自于你的输入流。其中FileOutputStream()中只是创建了一个字节输出流，其只能接受字节流的输出，所以它还需要与DataOutputStream()的配合才能完成输出，具体用法你可以查API
求一个Java实现自动下载的源代码
您好，这样的：
/**
*
*/
package com.b510.base.bean.install;
import java.io.File;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* @author hongten(hongtenzone@foxmail.com)
* @date 2013-2-24
*/
@SuppressWarnings("unchecked")
public class BeanUtils {
//公共部分
private static final String RT_1 = "\r\n";
private static final String RT_2 = RT_1+RT_1;
private static final String BLANK_1 =" ";
private static final String BLANK_4 =" ";
private static final String BLANK_8 =BLANK_4 + BLANK_4;
//注释部分
private static final String ANNOTATION_AUTHOR_PARAMTER = "@author ";
private static final String ANNOTATION_AUTHOR_NAME = "hongten(hongtenzone@foxmail.com)";
private static final String ANNOTATION_AUTHOR = ANNOTATION_AUTHOR_PARAMTER + ANNOTATION_AUTHOR_NAME;
private static final String ANNOTATION_DATE = "@date ";
private static final String ANNOTATION = "/**"+RT_1+BLANK_1+"*"+BLANK_1+ANNOTATION_AUTHOR +RT_1+BLANK_1+"*"+BLANK_1+ANNOTATION_DATE +getDate()+RT_1+BLANK_1+"*/"+RT_1;
//文件 地址
//private static final String BEAN_PATH = "com/b510/base/bean";
private static final String DAO_PATH = "com/b510/base/dao";
private static final String DAO_IMPL_PATH = "com/b510/base/dao/impl";
private static final String SERVICE_PATH = "com/b510/base/service";
private static final String SERVICE_IMPL_PATH = "com/b510/base/service/impl";
//包名
private static final String BEAN_URL = "com.b510.base.bean";
private static final String DAO_URL = "com.b510.base.dao";
private static final String DAO_IMPL_URL = "com.b510.base.dao.impl";
private static final String SERVICE_URL = "com.b510.base.service";
private static final String SERVICE_IMPL_URL = "com.b510.base.service.impl";
//基本类名称
private static final String BASE_DAO_NAME = DAO_URL + ".BaseDao";
private static final String ABSTRACT_BASE_DAO_IMPL_NAME = DAO_IMPL_URL + ".AbstractBaseDaoImpl";
private static final String BASE_SERVICE_NAME = SERVICE_URL + ".BaseService";
private static final String ABSTRACT_BASE_SERVICE_IMPL_NAME = SERVICE_IMPL_URL + ".AbstractBaseServiceImpl";
/**
* 创建bean的Daobr
*
* @param c
* @throws Exception
*/
public void createBeanDao(Class c) throws Exception {
String cName = c.getName();
String fileName = System.getProperty("user.dir") + "/src/" + DAO_PATH
+ "/" + getLastChar(cName) + "Dao.java";
File f = new File(fileName);
FileWriter fw = new FileWriter(f);
fw.write("package "+DAO_URL+";"+RT_2+ANNOTATION+"public interface " +
getLastChar(cName) + "Dao extends "+BASE_DAO_NAME+" " + cName + " {"+RT_2+"}");
fw.flush();
fw.close();
showInfo(fileName);
}
/**
* 创建bean的Dao的实现类
* @param c
* @throws Exception
*/
public void createBeanDaoImpl(Class c) throws Exception{
String cName = c.getName();
String fileName = System.getProperty("user.dir") + "/src/" + DAO_IMPL_PATH
+ "/" + getLastChar(cName) + "DaoImpl.java";
File f = new File(fileName);
FileWriter fw = new FileWriter(f);
fw.write("package "+DAO_IMPL_URL+";"+RT_2+ANNOTATION+"public class " +
getLastChar(cName) + "DaoImpl extends "+ABSTRACT_BASE_DAO_IMPL_NAME+"" +
cName + " implements "+DAO_URL+"."+getLastChar(cName)+"Dao{"+RT_2+"}");
fw.flush();
fw.close();
showInfo(fileName);
}
/**
* 创建bean的service
* @param c
* @throws Exception
*/
public void createBeanService(Class c) throws Exception{
String cName = c.getName();
String fileName = System.getProperty("user.dir") + "/src/" + SERVICE_PATH
+ "/" + getLastChar(cName) + "Service.java";
File f = new File(fileName);
FileWriter fw = new FileWriter(f);
fw.write("package "+SERVICE_URL+";"+RT_2+ANNOTATION+"public interface " +
getLastChar(cName) + "Service extends "+BASE_SERVICE_NAME+""+ cName +"{"+RT_2+"}");
fw.flush();
fw.close();
showInfo(fileName);
}
/**
* 创建bean的service的实现类
* @param c
* @throws Exception
*/
public void createBeanServiceImpl(Class c) throws Exception{
String cName = c.getName();
String fileName = System.getProperty("user.dir") + "/src/" + SERVICE_IMPL_PATH
+ "/" +getLastChar(cName)+"ServiceImpl.java";
File f = new File(fileName);
FileWriter fw = new FileWriter(f);
fw.write("package "+SERVICE_IMPL_URL+";"+RT_2+ANNOTATION+"public class "
+ getLastChar(cName) + "ServiceImpl extends "+ABSTRACT_BASE_SERVICE_IMPL_NAME+""+ cName
+ " implements "+SERVICE_URL+"."+getLastChar(cName)+"Service{"+RT_2+BLANK_4
+"private "+DAO_URL+"."+getLastChar(cName)+"Dao "+getLowercaseChar(getLastChar(cName))
+"Dao;"+RT_2+BLANK_4+"public void set"+getLastChar(cName)+"Dao("+DAO_URL+"."+getLastChar(cName)+"Dao "
+getLowercaseChar(getLastChar(cName))+"Dao){"+RT_1+BLANK_8+"this."+getLowercaseChar(getLastChar(cName))+"Dao = "
+getLowercaseChar(getLastChar(cName))+"Dao;"+RT_1+BLANK_4+"}"+RT_2+BLANK_4+"@Override"+RT_1+BLANK_4
+"public "+DAO_URL+"."+"BaseDao"+BEAN_URL+"."+getLastChar(cName)+" getBaseDao(){"+RT_1+BLANK_8
+"return "+getLowercaseChar(getLastChar(cName))+"Dao;"+RT_1+BLANK_4+"}"+RT_2+"}");
fw.flush();
fw.close();
showInfo(fileName);
}
/**
* 获取路径的最后面字符串br
* 如：br
* codestr = "com.b510.base.bean.User"/codebr
* code return "User";code
* @param str
* @return
*/
public String getLastChar(String str) {
if ((str != null) (str.length() 0)) {
int dot = str.lastIndexOf('.');
if ((dot -1) (dot (str.length() - 1))) {
return str.substring(dot + 1);
}
}
return str;
}
/**
* 把第一个字母变为小写br
* 如：br
* codestr = "UserDao";/codebr
* codereturn "userDao";/code
* @param str
* @return
*/
public String getLowercaseChar(String str){
return str.substring(0,1).toLowerCase()+str.substring(1);
}
/**
* 显示信息
* @param info
*/
public void showInfo(String info){
System.out.println("创建文件："+ info+ "成功！");
}
/**
* 获取系统时间
* @return
*/
public static String getDate(){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
return simpleDateFormat.format(new Date());
}
}
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