基于Java实现批量下载网络图片

package com.lcw.downloadutil.domain; public class Bean { private String phrase;
private String type;
private String url;
private Boolean hot;
private Boolean common;
private String category;
private String icon;
private String value;
private String picid; public String getPhrase() {
return phrase;
} public void setPhrase(String phrase) {
this.phrase = phrase;
} public String getType() {
return type;
} public void setType(String type) {
this.type = type;
} public String getUrl() {
return url;
} public void setUrl(String url) {
this.url = url;
} public Boolean getHot() {
return hot;
} public void setHot(Boolean hot) {
this.hot = hot;
} public Boolean getCommon() {
return common;
} public void setCommon(Boolean common) {
this.common = common;
} public String getCategory() {
return category;
} public void setCategory(String category) {
this.category = category;
} public String getIcon() {
return icon;
} public void setIcon(String icon) {
this.icon = icon;
} public String getValue() {
return value;
} public void setValue(String value) {
this.value = value;
} public String getPicid() {
return picid;
} public void setPicid(String picid) {
this.picid = picid;
} @Override
public String toString() {
return "Bean [phrase=" + phrase + ", type=" + type + ", url=" + url + ", hot=" + hot + ", common=" + common + ", category=" + category + ", icon=" + icon + ", value=" + value + ", picid=" + picid + "]";
} }

package com.lcw.downloadutil.utils; import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List; import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.lcw.downloadutil.domain.Bean; /**
* 工具类集合
*
* @author Rabbit_Lee
*
*/
public class HelpUtils {
/**
* 根据所提供的url地址获取Json数据
*
* @param path
* @return
*/
public String getHttpString(String path) {
// 存放获取到的数据
String info = "";
// 网络请求所需变量
InputStream in = null;
InputStreamReader reader = null;
BufferedReader bufferedReader = null;
try {
URL url = new URL(path);
// 根据Url打开地址，以utf-8编码的形式返回输入流
in = url.openStream();
reader = new InputStreamReader(in, "utf-8");
bufferedReader = new BufferedReader(reader);
// 临时接受数据变量
String temp = null;
while ((temp = bufferedReader.readLine()) != null) {
info += temp;
}
return info;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
reader.close();
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
} /**
* 将所提供的Json数据反序列化成Java对象（List集合）
*
* @param json
* @return
*/
public List<Bean> changeJsonToList(String json) {
// 利用Gson将JSON数据反序列化成JAVA对象
Gson gson = new Gson();
List<Bean> beans = gson.fromJson(json, new TypeToken<List<Bean>>() {
}.getType());
return beans;
} /**
* 下载图片，并按照指定的路径存储
* @param bean
* @param filePath
*/
public void makeImage(Bean bean, String filePath) {
// 网络请求所需变量
try {
//获取输入流
BufferedInputStream in = new BufferedInputStream(new URL(bean.getUrl()).openStream());
//创建文件流
File file = new File(filePath + bean.getPhrase()+".gif");
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));
//缓冲字节数组
byte[] data = new byte[2048];
int length = in.read(data);
while (length != -1) {
out.write(data, 0, data.length);
length = in.read(data);
}
System.out.println("正在执行下载任务：当前正在下载图片" + bean.getPhrase() + ".gif");
in.close();
out.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} }

package com.lcw.downloadutil.main; import java.util.List; import com.lcw.downloadutil.domain.Bean;
import com.lcw.downloadutil.utils.HelpUtils; public class TaskMain { private static final String URL = "这里涉及到Oauth2.0的一些个人隐私数据就不给出了";
private static String mJsonInfo; public static void main(String[] args) {
HelpUtils helpUtils = new HelpUtils();
// 获取Json数据
mJsonInfo = helpUtils.getHttpString(URL);
// 将Json数据反序列化成java对象
List<Bean> beans = helpUtils.changeJsonToList(mJsonInfo);
//循环遍历下载图片
for (int i = 0; i < beans.size(); i++) {
helpUtils.makeImage(beans.get(i), "C:/images/");
} } }