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金山网站制作,网站卖了对方做违法,广告设计公司vi,WordPress同步自媒体拆分JSON字符串​1.1按结构拆分​数组拆分​​#xff1a;若JSON包含大型数组#xff0c;可将其拆分为多个小数组。复制代码// 示例#xff1a;将大数组拆分为多个子数组JSONArray bigArray new JSONArray(jsonString);int chunkSize 100;for (int i 0; i bigArray.…拆分JSON字符串​1.1按结构拆分​数组拆分​​若JSON包含大型数组可将其拆分为多个小数组。复制代码// 示例将大数组拆分为多个子数组JSONArray bigArray new JSONArray(jsonString);int chunkSize 100;for (int i 0; i bigArray.length(); i chunkSize) {JSONArray chunk new JSONArray();for (int j i; j Math.min(i chunkSize, bigArray.length()); j) {chunk.put(bigArray.get(j));}String chunkJson chunk.toString();// 处理或保存chunkJson}复制代码​​对象拆分​​若JSON是嵌套对象可按层级拆分为子对象。1.2按大小拆分流式处理​​使用流式API如Jackson的JsonParser逐块读取JSON内容避免一次性加载到内存JsonFactory factory new JsonFactory();try (JsonParser parser factory.createParser(new File(large.json))) {while (parser.nextToken() ! null) {// 逐Token处理如按特定条件拆分}}回到顶部v压缩JSON字符串​2.1使用GZIP压缩​复制代码import java.util.zip.GZIPOutputStream;import java.io.ByteArrayOutputStream;public static byte[] compress(String data) throws IOException {ByteArrayOutputStream bos new ByteArrayOutputStream(data.length());try (GZIPOutputStream gzip new GZIPOutputStream(bos)) {gzip.write(data.getBytes());}return bos.toByteArray();}// 压缩后的数据可用于传输或存储byte[] compressed compress(jsonString);复制代码2.2使用Deflater压缩​复制代码import java.util.zip.Deflater;public static byte[] deflateCompress(String data) {Deflater deflater new Deflater();deflater.setInput(data.getBytes());deflater.finish();byte[] buffer new byte[1024];ByteArrayOutputStream outputStream new ByteArrayOutputStream();while (!deflater.finished()) {int count deflater.deflate(buffer);outputStream.write(buffer, 0, count);}deflater.end();return outputStream.toByteArray();}复制代码回到顶部v优化JSON体积​​3.1移除无用空格​使用紧凑格式无缩进、换行new JSONObject(jsonString).toString(); // 默认紧凑格式3.2​​缩短键名​将长字段名替换为短名称{n:Alice,a:30} // 原始键名可能为name、age回到顶部v流式处理大型JSON​​使用流式API逐步解析避免内存溢出复制代码// Jackson流式API示例JsonFactory factory new JsonFactory();try (JsonParser parser factory.createParser(new File(large.json))) {JsonToken token;while ((token parser.nextToken()) ! null) {if (token JsonToken.START_ARRAY) {while (parser.nextToken() ! JsonToken.END_ARRAY) {// 逐条处理数组元素JsonNode node parser.readValueAsTree();// 处理node...}}}}复制代码回到顶部v分页处理​其实也是拆分将数据拆成若干份回到顶部v实践方案复制代码import com.fasterxml.jackson.databind.JsonNode;import com.fasterxml.jackson.databind.ObjectMapper;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import org.apache.commons.codec.binary.Base64;import java.nio.charset.StandardCharsets;public class CompressHelper {private static final ObjectMapper objectMapper new ObjectMapper();/*** 方式1去除JSON中的空格/换行等冗余字符文本压缩* param formattedJson 格式化的JSON字符串含空格换行* return 紧凑格式的JSON字符串* throws IOException JSON解析异常*/public static String compressJsonByRemovingSpaces(String formattedJson) throws IOException {JsonNode jsonNode objectMapper.readTree(formattedJson);return objectMapper.writeValueAsString(jsonNode);}/*** 方式2使用GZIP算法对JSON字符串进行二进制压缩适合网络传输* param json 原始JSON字符串* return Base64编码的压缩后字符串可直接传输* throws IOException 压缩异常*/public static String compressJsonByGzip(String json) throws IOException {try (ByteArrayOutputStream byteOut new ByteArrayOutputStream();GZIPOutputStream gzipOut new GZIPOutputStream(byteOut)) {gzipOut.write(json.getBytes(UTF-8));gzipOut.finish();return Base64.encodeBase64String(byteOut.toByteArray());}}public static String decompressJson(String source) throws IOException {byte[] compressedData Base64.decodeBase64(source);try (ByteArrayInputStream byteIn new ByteArrayInputStream(compressedData);GZIPInputStream gzipIn new GZIPInputStream(byteIn);ByteArrayOutputStream byteOut new ByteArrayOutputStream()) {// 读取压缩数据并解压缩byte[] buffer new byte[1024];int len;while ((len gzipIn.read(buffer)) ! -1) {byteOut.write(buffer, 0, len);}return byteOut.toString(StandardCharsets.UTF_8.name());}}}