如果生成一个文本,只有一段话,像下面代码就可以了
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-disposition", "attachment;filename=aa.txt" );
byte[] aa="中国,你好".getBytes();
OutputStream out=response.getOutputStream();
out.write(aa);
out.close();
}如果servlet中获得的是一个List<Student>的列表,Student中,包含id,name,age属性
那么遍历这个List<Student>中的数据,要怎样并放到byte[]数组中。数组的大小要如何确定?
如何将数据都全部写入byte[]数组中后,再向客户端输出.
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-disposition", "attachment;filename=aa.txt" );
byte[] aa="中国,你好".getBytes();
OutputStream out=response.getOutputStream();
out.write(aa);
out.close();
}如果servlet中获得的是一个List<Student>的列表,Student中,包含id,name,age属性
那么遍历这个List<Student>中的数据,要怎样并放到byte[]数组中。数组的大小要如何确定?
如何将数据都全部写入byte[]数组中后,再向客户端输出.
package t.jya;import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;public class WN {
public static void main(String[] args) {
List<User> list=new ArrayList<User>();
User user1=new User();
user1.setAgeString("23");
user1.setName("张三");
list.add(user1);
User user2=new User();
user2.setAgeString("43");
user2.setName("李四");
list.add(user2);
FileWriter fw=null;
BufferedWriter bw = null;
try {
fw = new FileWriter(new File("d:\\aa.txt"));
bw=new BufferedWriter(fw);
if(list!=null&&list.size()>0){
for (User user : list) {
bw.write(user.getName()+" "+user.getAgeString()+"\r\n");
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if(bw!=null){
bw.close();
}
if(fw!=null){
fw.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
class User{
private String name;
private String ageString;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAgeString() {
return ageString;
}
public void setAgeString(String ageString) {
this.ageString = ageString;
}
}