IOUtils

org.apache.commons.io.IOUtils

 

1、IOUtils.toString(InputStream input)

 

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：

//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();
    }

 

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;
    }

 

/**
     * 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：

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();
		}
	}

}

 

。。