SpringBoot数据压缩实践方案

// 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
}

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
    }
}

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);

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();
}

new JSONObject(jsonString).toString(); // 默认紧凑格式

{"n":"Alice","a":30} // 原始键名可能为"name"、"age"

// 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...
            }
        }
    }
}

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());
        }
    }
}