java，

java，

java日期转换，转载自http://www.cnblogs.com/android-html5/archive/2012/05/12/2533652.html

package com.ttgbook.conver;  

import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Date;  

public class Conver {  

    //把日期转为字符串  
    public static String ConverToString(Date date)  
    {  
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");  

        return df.format(date);  
    }  
    //把字符串转为日期  
    public static Date ConverToDate(String strDate) throws Exception  
    {  
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");  
        return df.parse(strDate);  
    }  

}  

java中的转义字符

java 运算符优先级

java 壓縮

import java.util.*
public static void zipFiles(List<byte[]> inputFileBytes, String zipfile) {
        byte[] buf = new byte[1024];
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                    zipfile));
            for (int j = 0; j < inputFileBytes.size(); j++) {
                byte[] bytes = inputFileBytes.get(j);
                InputStream in = new ByteArrayInputStream(bytes);
                out.putNextEntry(new ZipEntry("文件" + j + ".doc"));
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                out.closeEntry();
                in.close();
            }
            out.close();
            System.out.println("压缩完成.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

import java.util.*
public static void zipFiles(File[] srcfile, String zipfile) {
        byte[] buf = new byte[1024];
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                    zipfile));
            for (int i = 0; i < srcfile.length; i++) {
                InputStream in = new FileInputStream(srcfile[i]);
                out.putNextEntry(new ZipEntry(srcfile[i].getName()));
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                out.closeEntry();
                in.close();
            }
            out.close();
            System.out.println("压缩完成.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
public static void zipFiles(List<byte[]> inputFileBytes, String zipfile) {
        try {
            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(
                    zipfile));
            for (int j = 0; j < inputFileBytes.size(); j++) {
                ZipEntry ze = new ZipEntry("文件" + (j + 1) + ".doc");
                zos.putNextEntry(ze);
                InputStream in = new ByteArrayInputStream(inputFileBytes.get(j));
                byte[] buf = new byte[1024];
                int len;
                while ((len = in.read(buf)) > 0) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
            zos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

java下载图片

public void exportReceipt() throws IOException {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        String baseUrl = getRequest().getSession().getServletContext()
                .getRealPath("/");
        FileInputStream in;
        in = new FileInputStream(baseUrl + "tempImg/receipt.png");
        HttpServletResponse response = (HttpServletResponse) facesContext
                .getExternalContext().getResponse();
        response.setContentType("png");
        response.setHeader(
                "Content-Disposition",
                "attachment;"
                        + "filename="
                        + java.net.URLEncoder.encode(
                                getMessage("student.receipt", null) + ".png",
                                "UTF-8"));
        try {
            IOUtils.copy(in, response.getOutputStream());
        } finally {
            IOUtils.closeQuietly(in);
        }
        response.getOutputStream().flush();
        facesContext.responseComplete();
    }

java list快速初始化

List<String> summaryScoreMessages2 = Arrays.asList("comment", "notes",
                "prize");

private static void fun2() {
    String url1 = Test.class.getResource("").toString();
    String url2 = Test.class.getResource("/").toString();
    System.out.println(url1.replace(url2, ""));
}

java获取src目录下的文件

private String getCurrentClassUrl() {
    String url1 = this.getClass().getResource("").toString();
    String url2 = this.getClass().getResource("/").toString();
    return url1.replace(url2, "");
}

 private byte[] getIcon(String iconFileName) throws IOException {
    String templatePath = getCurrentClassUrl() + "/" + iconFileName;
    InputStream in = this.getClass().getClassLoader()
            .getResourceAsStream(templatePath);
    if (in != null) {
        in.close();
    }
    return inputStreamToBytes(in);
}