java的下載代碼 java程序下載
javaweb下載的代碼怎么寫
這個是用spSmartUpload實(shí)現(xiàn)的 使用的時候?qū)雜martupload的jar包
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jsp頁面
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);//出現(xiàn)下載提示
su.downloadFile("e:\\abc\\" + fname);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
java下載方面的代碼
你的這段代碼有兩處讓人疑惑。其一、File()這個構(gòu)造函數(shù)，自已查下API
其二、FileOutputStream，F(xiàn)ileOutputStream(String name)創(chuàng)建一個向具有指定名稱的文件中寫入數(shù)據(jù)的輸出文件流。它只是創(chuàng)建了一個輸出流，其中沒有具體的值，那么這個值來自哪呢，其就來自于你的輸入流。其中FileOutputStream()中只是創(chuàng)建了一個字節(jié)輸出流，其只能接受字節(jié)流的輸出，所以它還需要與DataOutputStream()的配合才能完成輸出，具體用法你可以查API
求一個Java實(shí)現(xiàn)自動下載的源代碼
您好，這樣的：
/**
*
*/
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;
//注釋部分
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";
//基本類名稱
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";
/**
* 創(chuàng)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);
}
/**
* 創(chuàng)建bean的Dao的實(shí)現(xiàn)類
* @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);
}
/**
* 創(chuàng)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);
}
/**
* 創(chuàng)建bean的service的實(shí)現(xiàn)類
* @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);
}
/**
* 獲取路徑的最后面字符串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;
}
/**
* 把第一個字母變?yōu)樾慴r
* 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);
}
/**
* 顯示信息
* @param info
*/
public void showInfo(String info){
System.out.println("創(chuàng)建文件："+ info+ "成功！");
}
/**
* 獲取系統(tǒng)時間
* @return
*/
public static String getDate(){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
return simpleDateFormat.format(new Date());
}
}
本文題目：java的下載代碼 java程序下載
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