//代码://测试类:public class Test {
public static void main(String[] args) {
Image img = new Image();
String str = img.getRimg();
img.getWimg(str);
}
} //输入、输出类import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;public class Image {
public String getRimg(){
String s = "";
int i;
try {
FileReader in = new FileReader("text\\img.txt");
while((i=in.read())!=-1){
s = s+(char)i;
}
in.close();
}catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}finally{
return s;
}
} //输出类
public void getWimg(String content){
try {
FileWriter out = new FileWriter("text\\img.jpg");
char[] ch = content.toCharArray();
System.out.println(ch);
for(int i=0;i<ch.length;i++){
out.write(ch[i]);
}
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}请教大家为什么我运行出来的图片,没有预览啊,是空白的!代码那里有错吗?
在jsp中通过读取流在servlet可以显示图片!!
需要把servlet 设置为 text/image (可能是)
长时间没动web了
2、建议用BufferedOutputStream、BufferedInputStream提高速度
3、大量String i;
i+= somestring;建议使用StringBuilder、StringBuffer,不然跑N久都不出结果import java.io.*;public class Test {
public static void main(String[] args) {
Image img = new Image();
String str = img.getRimg();
img.getWimg(str);
}
} //输入、输出类class Image {
public String getRimg(){
StringBuilder builder = new StringBuilder(1000000);
int i;
try {
new File("text\\img.txt").createNewFile();
FileInputStream in = new FileInputStream("text\\img.txt");
BufferedInputStream bis = new BufferedInputStream(in);
while((i=in.read())!=-1){
builder.append((char)i);
}
bis.close();
}catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}finally{
return builder.toString();
}
} //输出类
public void getWimg(String content){
try {
new File("text\\img.txt").createNewFile();
FileOutputStream out = new FileOutputStream("text\\img.jpg");
BufferedOutputStream bos = new BufferedOutputStream(out);
char[] ch = content.toCharArray();
System.out.println(ch);
for(int i=0;i<ch.length;i++){
bos.write(ch[i]);
}
bos.flush();
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}