IOUtils的使用

[转载于http://uule.iteye.com/blog/2107010](http://uule.iteye.com/blog/2107010)

1、IOUtils.toString(InputStream input)

 

Java代码  

1. protected boolean writeEJBJar(String path, WebServiceProject project){  
2.         String ejbJar = null;  
3.         try {  
4.             ejbJar = IOUtils.toString(this.getClass().getClassLoader().getResourceAsStream(“META-INF/ws/ejb-jar.comm.template”));  
5.               
6.             logger.debug(”get template pass…”);  
7.               
8.             ejbJar = String.format(ejbJar, project.getName());  
9.               
10.             logger.debug(”template format :\n” + ejbJar);  
11.               
12.             FileUtils.writeStringToFile(new File(path), ejbJar, “UTF-8”);  
13.               
14.             logger.debug(”write ” + path + “ to harddrive pass…”);  
15.         } catch (Exception e) {  
16.             e.printStackTrace();  
17.             logger.error(”writeBuild error : ” + e.getMessage());  
18.             return false;  
19.         }  
20.         return true;  
21.     }  

protected boolean writeEJBJar(String path, WebServiceProject project){        String ejbJar = null;        try {            ejbJar = IOUtils.toString(this.getClass().getClassLoader().getResourceAsStream("META-INF/ws/ejb-jar.comm.template"));            logger.debug("get template pass...");            ejbJar = String.format(ejbJar, project.getName());            logger.debug("template format :\n" + ejbJar);            FileUtils.writeStringToFile(new File(path), ejbJar, "UTF-8");            logger.debug("write " + path + " to harddrive pass...");        } catch (Exception e) {            e.printStackTrace();            logger.error("writeBuild error : " + e.getMessage());            return false;        }        return true;    }

 

源码：

Java代码  

1. //注意此处用的StringWriter来实现字符输出展示  
2. public static String toString(InputStream input) throws IOException {  
3.         StringWriter sw = new StringWriter();  
4.         copy(input, sw);  
5.         return sw.toString();  
6.     }  

//注意此处用的StringWriter来实现字符输出展示public static String toString(InputStream input) throws IOException {        StringWriter sw = new StringWriter();        copy(input, sw);        return sw.toString();    }

 

Java代码  

1. public static void copy(InputStream input, Writer output)  
2.             throws IOException {  
3.         InputStreamReader in = new InputStreamReader(input);  
4.         copy(in, output);  
5.     }  
6.   
7.   
8.     public static int copy(Reader input, Writer output) throws IOException {  
9.         long count = copyLarge(input, output);  
10.         if (count > Integer.MAX_VALUE) {  
11.             return -1;  
12.         }  
13.         return (int) count;  
14.     }  

public static void copy(InputStream input, Writer output)            throws IOException {        InputStreamReader in = new InputStreamReader(input);        copy(in, output);    }    public static int copy(Reader input, Writer output) throws IOException {        long count = copyLarge(input, output);        if (count > Integer.MAX_VALUE) {            return -1;        }        return (int) count;    }

 

Java代码  

1. /** 
2.      * The default buffer size to use. 
3.      */  
4.     private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;  
5.   
6.       
7.     public static long copyLarge(Reader input, Writer output) throws IOException {  
8.         char[] buffer = new char[DEFAULT_BUFFER_SIZE];  
9.         long count = 0;  
10.         int n = 0;  
11.         while (-1 != (n = input.read(buffer))) {  
12.             output.write(buffer, 0, n);  
13.             count += n;  
14.         }  
15.         return count;  
16.     }  

/**     * The default buffer size to use.     */    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;    public static long copyLarge(Reader input, Writer output) throws IOException {        char[] buffer = new char[DEFAULT_BUFFER_SIZE];        long count = 0;        int n = 0;        while (-1 != (n = input.read(buffer))) {            output.write(buffer, 0, n);            count += n;        }        return count;    }

 

InputStream  => InputStreamReader => Reader

StringWriter => Writer

 

 

注意此处用的StringWriter来实现字符输出展示

 

获取异常堆栈信息，也是使用StringWriter展示，如：

Java代码  

1. import java.io.PrintWriter;  
2. import java.io.StringWriter;  
3.   
4. public class ExceptionUtils {  
5.   
6.     public static String getStackTrace(Throwable t) {  
7.         StringWriter sw = new StringWriter();  
8.         PrintWriter pw = new PrintWriter(sw);  
9.         try {  
10.             t.printStackTrace(pw);  
11.             return sw.toString();  
12.         } finally {  
13.             pw.close();  
14.         }  
15.     }  
16.   
17. }  

import java.io.PrintWriter;import java.io.StringWriter;public class ExceptionUtils {    public static String getStackTrace(Throwable t) {        StringWriter sw = new StringWriter();        PrintWriter pw = new PrintWriter(sw);        try {            t.printStackTrace(pw);            return sw.toString();        } finally {            pw.close();        }    }}