java 加载https/http/本地类型路径的图片

一个读取网络路径和本地路径 图片的例子(亲测可用)

需求:

1.读取https、http类型,以及本地类型的图片。

其中,加载https类型的图片时不能沿用http的获取方法,否则会报unable to find valid certification path to requested target 的错误。

具体原因是,因为https(http+SSL)简单讲是http的安全版,即http下加入SSL层,https的安全基础是SSL,因此加密的详细内容就需要SSL。

解决办法:此处使用https的Get请求来解决证书验证的问题。

2.用日志记录相关信息(引入commons-logging-1.1.jar包

3.为了安全 ,对结果数据进行编码、解码,

问题:

首先为什么BASE64Encoder和BASE64Decoder在Eclipse中不能使用?

       编码解码使用sun包下的BASE64Encoder和BASE64Decoder两个工具把任意序列的8位字节描述为一种不易被人直接识别的形式;但不能使用是因为他们是Sun公司专用的API,在Eclipse后来的版本中都不能直接使用,但是直接使用文本编辑器编写代码,然后使用javac编译,java去执行是没有问题的。

怎么设置才可以在Eclipse中使用BASE64Encoder和BASE64Decoder?

       右击项目 --> Properties --> Java Build Path --> 点开JRE SystemLibrary --> 点击Access rules --> Edit --> Add --> Resolution选择Accessible--> Rule Pattern 填** --> OK

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class TestReadImgWithUrlOrPath {
	public static Log log=LogFactory.getLog(TestReadImgWithUrlOrPath.class);

	public static void main(String s[]) throws IOException
	{
		String urlOrPath="C:\\Users\\files\\Pictures\\kaola.jpg";
		
		//String urlOrPath="http://pic4.nipic.com/20091217/3885730_124701000519_2.jpg";
		System.out.println(urlOrPath);
		System.out.println(readImg(urlOrPath));
		
	}
	/*
	 * 读取远程和本地文件图片
	 */
	public static String readImg(String urlOrPath){
        InputStream in = null;
        try {
          byte[] b ;
       //加载https途径的图片(要避开信任证书的验证)
         if(urlOrPath.toLowerCase().startsWith("https")){
            b=HttpsUtils.doGet(url);
         }else if(urlOrPath.toLowerCase().startsWith("http")){ 
          //加载http途径的图片
            	URL url = new URL(urlOrPath);
    			in = url.openStream();    			           	
            }else{ //加载本地路径的图片
                File file = new File(urlOrPath);
                if(!file.isFile() || !file.exists() || !file.canRead()){
                    log.info("图片不存在或文件错误");
                    return "error";
                }                
                in = new FileInputStream(file);
            }
            b = getByte(in); //调用方法,得到输出流的字节数组
			return base64ToStr(b);    //调用方法,为防止异常 ,得到编码后的结果

        } catch (Exception e) {
        	log.error("读取图片发生异常:"+ e);
        	return "error";
        }
    }
	
	public static byte[] getByte(InputStream in) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream();		
		try {
			byte[] buf=new byte[1024]; //缓存数组
			while(in.read(buf)!=-1){ //读取输入流中的数据放入缓存,如果读取完则循环条件为false;
				out.write(buf); //将缓存数组中的数据写入out输出流,如果需要写到文件,使用输出流的其他方法
				}
			out.flush();
			return out.toByteArray();	//将输出流的结果转换为字节数组的形式返回	(先执行finally再执行return	)
		} finally{
			if(in!=null){
					in.close();
			}
			if(out!=null){
				out.close();
			}			
		}
	}
	
	/*
	 * 编码
	 * Base64被定义为:Base64内容传送编码被设计用来把任意序列的8位字节描述为一种不易被人直接识别的形式
	 */
	public static String base64ToStr(byte[] bytes) throws IOException {
		String content = "";
		content = new BASE64Encoder().encode(bytes);
		return content.trim().replaceAll("\n", "").replaceAll("\r", ""); //消除回车和换行
	}
	/*
	 * 解码
	 */
	public static byte[] strToBase64(String content) throws IOException {
		if (null == content) {
			return null;
		}
		return new BASE64Decoder().decodeBuffer(content.trim());
	}

}
import javax.net.ssl.*;
import java.io.*;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * @desc: 实现https请求,可用于加载https路径的存储图片,避开信任证书的验证。
 */
public class HttpsUtils {
  private static final class DefaultTrustManager implements X509TrustManager {
	@Override
	public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
	}

	@Override
	public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
	}

	@Override
	public X509Certificate[] getAcceptedIssuers() {
	  return null;
	}
  }

  private static HttpsURLConnection getHttpsURLConnection(String uri, String method) throws IOException {
	SSLContext ctx = null;
	try {
	  ctx = SSLContext.getInstance("TLS");
	  ctx.init(new KeyManager[0], new TrustManager[]{new DefaultTrustManager()}, new SecureRandom());
	} catch (KeyManagementException e) {
	  e.printStackTrace();
	} catch (NoSuchAlgorithmException e) {
	  e.printStackTrace();
	}
	SSLSocketFactory ssf = ctx.getSocketFactory();

	URL url = new URL(uri);
	HttpsURLConnection httpsConn = (HttpsURLConnection) url.openConnection();
	httpsConn.setSSLSocketFactory(ssf);
	httpsConn.setHostnameVerifier(new HostnameVerifier() {
	  @Override
	  public boolean verify(String arg0, SSLSession arg1) {
		return true;
	  }
	});
	httpsConn.setRequestMethod(method);
	httpsConn.setDoInput(true);
	httpsConn.setDoOutput(true);
	return httpsConn;
  }

  private static byte[] getBytesFromStream(InputStream is) throws IOException {
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	byte[] kb = new byte[1024];
	int len;
	while ((len = is.read(kb)) != -1) {
	  baos.write(kb, 0, len);
	}
	byte[] bytes = baos.toByteArray();
	baos.close();
	is.close();
	return bytes;
  }

  private static void setBytesToStream(OutputStream os, byte[] bytes) throws IOException {
	ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
	byte[] kb = new byte[1024];
	int len;
	while ((len = bais.read(kb)) != -1) {
	  os.write(kb, 0, len);
	}
	os.flush();
	os.close();
	bais.close();
  }

  public static byte[] doGet(String uri) throws IOException {
	HttpsURLConnection httpsConn = getHttpsURLConnection(uri, "GET");
	return getBytesFromStream(httpsConn.getInputStream());
  }

  public static byte[] doPost(String uri, String data) throws IOException {
	HttpsURLConnection httpsConn = getHttpsURLConnection(uri, "POST");
	setBytesToStream(httpsConn.getOutputStream(), data.getBytes());
	return getBytesFromStream(httpsConn.getInputStream());
  }
}

 

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