Question

我有一个使用api数据的react组件：

 public class ReadEntry {
String uid,name,yob;
String ns;

public ReadEntry(){}
public List parse(InputStream in) throws XmlPullParserException, IOException {
    try {
        XmlPullParser parser = Xml.newPullParser();
        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
        parser.setInput(in, null);
        parser.nextTag();
        return readFeed(parser);
    } finally {
        in.close();
    }
}

private List readFeed(XmlPullParser parser) throws XmlPullParserException, IOException {
    List entries = new ArrayList();

    parser.require(XmlPullParser.START_TAG, ns, "PrintLetterBarcodeData");
    while (parser.next() != XmlPullParser.END_TAG) {
        if (parser.getEventType() != XmlPullParser.START_TAG) {
            continue;
        }
        String name = parser.getName();
        // Starts by looking for the entry tag
        //if (name.equals("entry")) {
        entries.add(readEntry(parser));
        // } else {
        // skip(parser);
        // }
    }
    return entries;
}


public ReadEntry(String uid, String name, String yob) {
    this.uid = uid;
    this.name = name;
    this.yob = yob;
}

ReadEntry readEntry(XmlPullParser parser) throws XmlPullParserException, IOException {
    parser.require(XmlPullParser.START_TAG, ns, "entry");
    String title = null;
    String summary = null;
    String link = null;
    while (parser.next() != XmlPullParser.END_TAG) {
        if (parser.getEventType() != XmlPullParser.START_TAG) {
            continue;
        }
        String name = parser.getName();
        if (name.equals("uid")) {
            title = readTitle(parser);
        } else if (name.equals("name")) {
            summary = readSummary(parser);
        } else if (name.equals("yob")) {
            link = readLink(parser);
        } else {
            // skip(parser);
        }
    }
    return new ReadEntry(title, summary, link);
}

// Processes title tags in the feed.
private String readTitle(XmlPullParser parser) throws IOException, XmlPullParserException {
    parser.require(XmlPullParser.START_TAG, ns, "uid");
    String title = readText(parser);
    parser.require(XmlPullParser.END_TAG, ns, "uid");
    return title;
}

// Processes link tags in the feed.
private String readLink(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "yob");
    String link = readText(parser);
    //String tag = parser.getName();
    /*String relType = parser.getAttributeValue(null, "yob");
    if (tag.equals("yob")) {
        if (relType.equals("yob")){
            link = parser.getAttributeValue(null, "yob");
            parser.nextTag();
        }
    }*/
    parser.require(XmlPullParser.END_TAG, ns, "yob");
    return link;
}

// Processes summary tags in the feed.
private String readSummary(XmlPullParser parser) throws IOException, XmlPullParserException {
    parser.require(XmlPullParser.START_TAG, ns, "name");
    String summary = readText(parser);
    parser.require(XmlPullParser.END_TAG, ns, "name");
    return summary;
}

// For the tags title and summary, extracts their text values.
private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
    String result = "";
    if (parser.next() == XmlPullParser.TEXT) {
        result = parser.getText();
        parser.nextTag();
    }
    System.out.println("the result is"+result);
    return result;
}

这就是.JSON的样子：

UPDATE [table]  
SET [col] = CONVERT(DECIMAL(21, 20), [col1])
GO

ALTER TABLE [non_det_liabilities] 
    MODIFY [col1] DECIMAL(21, 20)

我需要从“ images / primary”中的“ large”访问image src链接。在这里尝试了许多变体，但它总是返回为空或未定义的对象：/

Answer 1

const {images:{primary:{large}}} = this.state.output;
console.log(large)

您的图像路径将具有较大的变量。

从.JSON访问值的问题（可能是路径问题）

1 个答案: