我在Java中解析JSON文件。清洁JSON，不是杰克逊，也不是GSON。 我的问题是当我加载一个新的.json文件时，我的JTree没有刷新。 我在stackoverflow和其他一些论坛上尝试了很多不同的选项，但我没有找到解决方案。
我将在下面编写我的程序代码。
NodeStorage，NodeEntity等是继承DefaultMutableTreeNode的NodeInfo的子类。
ViewTree扩展了DefaultTreeModel。
你应该专门查找的代码函数是 initialiseTree 所以我会在这里编写它和其余的代码（整个gui类将在另一个窗口中写在这个类下面）：
public void initialiseTree() throws IOException, JSONException {
this.setScrollPane(null);
this.setJtree(null);
this.setViewTree(null);
if(this.getPathMetaschema() == null) {
this.setNodeStorage(new NodeStorage(new ModelStorage("Empty root", "emptroot", null)));
}
else {
JSONinit(pathMetaschema);
setNodeStorage(new NodeStorage(this.getModelStorage()));
}
this.setViewTree(new ViewTree(this.getNodeStorage()));
this.getViewTree().setMyRoot(this.getNodeStorage());
this.getViewTree().reload(this.getNodeStorage());
this.getViewTree().nodeChanged(this.getViewTree().getMyRoot());
// this.getViewTree().addTreeSelectionListener(new ControllerTree(this));
// TODO: OVO NIJE BILO OVDE VEC JE BILO U INICIJALIZACIJI POCETNOJ. RESITI PROBLEM.
setJtree(new JTree(this.getViewTree()));
jtree.setEditable(true);
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode) this.getViewTree().getRoot();
do {
if (currentNode.getLevel()==1)
jtree.expandPath(new TreePath(currentNode.getPath()));
currentNode = currentNode.getNextNode();
}
while (currentNode != null);
// jtree.setExpandsSelectedPaths(false);
jtree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
scrollPane = new JScrollPane(this.getJtree());
add(scrollPane, BorderLayout.WEST);
getJtree().setCellRenderer(new MyTreeCellRenderer());
SwingUtilities.updateComponentTreeUI(this.getJtree());
// scrollPane.repaint();
// this.getJtree().repaint();
// this.repaint();
// this.revalidate();
// this.validate();
}
以下是该课程的代码：
/**
* Main view class that will provide all the gui needed.
* It extends <code>JFrame</code>.
*
* @author Ivan, Strahinja, Vukasin
*/
public class View extends JFrame {
private static final long serialVersionUID = 1L;
/**
* Model of storage that will get storage from the database via JSON.
*/
private ModelStorage modelStorage;
/**
* Model of entity that will be previewed. It's received from <code>JSON</code> and from modelStorage.
*/
private ModelEntity modelEntity;
/**
* Instace of class <code>ViewOurMenuBar</code>
*/
private ViewOurMenuBar ourMenuBar;
/**
* Instace of class <code>ViewToolBar</code>
*/
private ViewToolBar toolBar;
/**
* Instace of class <code>ViewTree</code>
*/
private ViewTree viewTree;
/**
* Instance of class <code>ViewTable</code> that will provide upper table on the view.
* In it data is showed and attributes(colons) are loaded
*/
private ViewTable gornjaTable;
/**
* Instace of class <code>ViewTable</code> that will provide bottom table on the view.
* In it data is showed and attributes(colons) are loaded
*/
private ViewTable donjaTable;
private ViewToolBar tableUpToolBar;
private NodeStorage nodeStorage;
private NodeEntity ne;
private JTable tblStudenti;
private JTable tblStudenti02;
private JSplitPane splitTables;
private JSplitPane split;
private JScrollPane scrollPane;
private JTabbedPane tabbedPane;
private JScrollPane scrollTb1;
private JScrollPane scrollTb2;
private JPanel panelUp;
private JPanel panelDown;
private String pathMetaschema;
private JTree jtree;
public View() throws IOException, JSONException {
this.setPathMetaschema(null);
this.initialise();
}
public View(String path) throws IOException, JSONException {
this.setPathMetaschema(path);
// this.JSONinit(path);
this.initialise();
}
public void initialise() throws IOException, JSONException {
this.setTitle("InfoViewer");
/*
* Initialisation of the JFrame position, size and location.
*/
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int screenWidth = screenSize.width;
int screenHeight = screenSize.height;
this.setSize(2*screenWidth/3, 2*screenHeight/3);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
/*
* Icon of the InfoViewer.
*/
Image image = kit.getImage("images/IconInfoViewer.png");
setIconImage(image);
/*
* Other initialization methods:
* LookAndFeel, MenuBar, ToolBar, Tree.
*/
this.initialiseLookAndFeel();
this.initialiseMenuBar();
this.initialiseToolBar();
this.initialiseTree();
tabbedPane = new JTabbedPane();
scrollTb1 = new JScrollPane();
setScrollTb2(new JScrollPane());
splitTables = new JSplitPane();
split = new JSplitPane();
panelUp = new JPanel(new BorderLayout());
panelDown = new JPanel(new BorderLayout());
tableUpToolBar = new ViewToolBar();
// scrollPane = new JScrollPane(this.getJtree());
// Object[] columns = new Object[] { "Dosije", "Ime", "Prezime" };
// Object[][] data = {
// { "ra1/2011", "Petar", "Petrovic" },
// { "ra1/2011", "Lazar", "Lazić" },
// { "ra2/2011", "Milan", "Kova�ević" },
// { "ra3/2011", "Ana", "Petrović" },
// { "ra4/2011", "Bojan", "Bakić" },
// { "ra5/2011", "Dragan", "Kova�ević" },
// { "ra6/2011", "Ivan", "Ivić" } };
// this.getViewTree().addMouseListener(new ControllerTree(this.getViewTree()));
// this.getViewTree().setCellRenderer(new MyTreeCellRenderer());
// this.getOurMenuBar().addMouseListener(new ControllerMenuBar(this.getOurMenuBar()));
}
public JSplitPane getSplit() {
return split;
}
private boolean isValidJSON (String jsonString){
boolean valid = false;
try {
@SuppressWarnings("deprecation")
final JsonParser parser = new ObjectMapper().getJsonFactory()
.createJsonParser(jsonString);
while (parser.nextToken() != null) {
}
valid = true;
} catch (JsonParseException jpe) {
//jpe.printStackTrace();
} catch (IOException ioe) {
// ioe.printStackTrace();
}
return valid;
}
public String loadJson(String metaschemaPath) throws IOException{
BufferedReader bf1 = new BufferedReader(new InputStreamReader(
new FileInputStream(new File(metaschemaPath))));
StringBuilder sb = new StringBuilder();
String line = bf1.readLine();
while (line != null) {
sb.append(line);
sb.append("\n");
line = bf1.readLine();
}
bf1.close();
return sb.toString();
}
public void JSONinit(String path) throws IOException, JSONException {
String metaschemaPath = path;
// System.out.println("JSON INIT ENTER");
String json = loadJson(metaschemaPath);
// System.out.println(isValidJSON(json));
if (isValidJSON(json)){
BufferedReader bf = new BufferedReader(new InputStreamReader(
new FileInputStream(new File(metaschemaPath))));
JSONTokener tokener = new JSONTokener(bf);
JSONObject object = new JSONObject(tokener);
bf.close();
String storageName = object.getJSONObject("storage").getString("name");
String storageKey = object.getJSONObject("storage").getString("key");
this.modelStorage = new ModelStorage(storageName, storageKey, metaschemaPath);
System.out.println("Storage: " + this.modelStorage.getName() + " ,Key: " + this.modelStorage.getKey());
JSONArray arrayPackages = object.getJSONObject("storage").getJSONArray("packages");
for(int i = 0; i < arrayPackages.length(); i++) {
// U�itavanje paketa
JSONObject packageObject = arrayPackages.getJSONObject(i);
String name = packageObject.getString("name");
String key = packageObject.getString("key");
System.out.println("********* " + name + " ***********");
ModelPackage modelPackage = new ModelPackage(name, key);
// U�itavanje liste paketa u ovaj paket.
JSONArray arrayListOfPackages = packageObject.getJSONArray("listOfPackages");
// *** ***
// Šta ćemo da radimo ako u listi paketa paket sadrži i entitete i druge pakete?
for(int j = 0; j < arrayListOfPackages.length(); j++) {
JSONObject listOfPackagesObject = arrayListOfPackages.getJSONObject(j);
String namePackage = listOfPackagesObject.getString("name");
String keyPackage = listOfPackagesObject.getString("key");
ModelPackage modelListPackage = new ModelPackage(namePackage, keyPackage);
modelPackage.getPackages().add(modelListPackage);
System.out.println("\tPackage: " + modelListPackage.getName() + ", Key: " + modelListPackage.getKey());
}
// U�itavanje entiteta u paket
JSONArray arrayListOfEntities = packageObject.getJSONArray("entities");
for(int k = 0; k < arrayListOfEntities.length(); k++) {
JSONObject entityObject = arrayListOfEntities.getJSONObject(k);
String nameEntity = entityObject.getString("name");
String keyEntity = entityObject.getString("key");
ModelEntity modelEntity = new ModelEntity(nameEntity, keyEntity);
System.out.println("\t\tEntity: " + modelEntity.getName() + ", Key: " + modelEntity.getKey());
// U�itavanje atributa entiteta
JSONArray arrayAttributes = entityObject.getJSONArray("attributes");
for(int m = 0; m < arrayAttributes.length(); m++) {
JSONObject attributeObject = arrayAttributes.getJSONObject(m);
String nameAttribute = attributeObject.getString("name");
String keyAttribute = attributeObject.getString("key");
ModelAttribute modelAttribute = new ModelAttribute(nameAttribute, keyAttribute);
System.out.println("\t\t\tAttribute: " + modelAttribute.getName() + ", Key: " + modelAttribute.getKey());
modelEntity.getAttributes().add(modelAttribute);
}
// U�itavanje relacija entiteta
JSONArray arrayRelations = entityObject.getJSONArray("relations");
for(int m = 0; m < arrayRelations.length(); m++) {
JSONObject relationObject = arrayRelations.getJSONObject(m);
String nameRelation = relationObject.getString("name");
String keyRelation = relationObject.getString("key");
String linkedEntityKey = relationObject.getString("linkedEntityKey");
ModelRelation modelRelation = new ModelRelation(nameRelation, keyRelation, modelEntity, linkedEntityKey);
System.out.println("\t\t\tRelation: " + modelRelation.getName() + ", Key: " + modelRelation.getKey());
modelEntity.getRelations().add(modelRelation);
}
modelPackage.getEntities().add(modelEntity);
}
this.modelStorage.getPackages().add(modelPackage);
}
} else {
System.out.println("JSON metasema nije validna!");
System.exit(0);
}
System.out.println("--------------------------------------------------------------");
System.out.println(this.modelStorage.getName() + ": ");
System.out.println("Packages:");
for(ModelPackage mp: this.modelStorage.getPackages()) {
System.out.println("\t" + mp.getName() + ": ");
System.out.println("\t\tPackages:");
for(ModelPackage mp2: mp.getPackages()) {
System.out.println("\t\t\t" + mp2.getName());
}
System.out.println("\t\tEntities:");
for(ModelEntity me: mp.getEntities()) {
System.out.println("\t\t\t\t" + me.getName() + ": ");
System.out.println("\t\t\t\tAttributes:");
for(ModelAttribute ma: me.getAttributes()) {
System.out.println("\t\t\t\t\t" + ma.getName());
}
System.out.println("\t\t\t\tRelations:");
for(ModelRelation mr: me.getRelations()) {
System.out.println("\t\t\t\t\t" + mr.getName() + " " + mr.getLinkedEntityKey());
}
}
}
// System.out.println("JSON INIT EXIT");
}
public JScrollPane getScrollTb1()
{
return scrollTb1;
}
public void setScrollTb1(JScrollPane scrollTb1)
{
this.scrollTb1 = scrollTb1;
}
public void initialiseTree() throws IOException, JSONException {
this.setScrollPane(null);
this.setJtree(null);
this.setViewTree(null);
if(this.getPathMetaschema() == null) {
this.setNodeStorage(new NodeStorage(new ModelStorage("Empty root", "emptroot", null)));
}
else {
JSONinit(pathMetaschema);
setNodeStorage(new NodeStorage(this.getModelStorage()));
}
this.setViewTree(new ViewTree(this.getNodeStorage()));
this.getViewTree().setMyRoot(this.getNodeStorage());
this.getViewTree().reload(this.getNodeStorage());
this.getViewTree().nodeChanged(this.getViewTree().getMyRoot());
// this.getViewTree().addTreeSelectionListener(new ControllerTree(this));
// TODO: OVO NIJE BILO OVDE VEC JE BILO U INICIJALIZACIJI POCETNOJ. RESITI PROBLEM.
setJtree(new JTree(this.getViewTree()));
jtree.setEditable(true);
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode) this.getViewTree().getRoot();
do {
if (currentNode.getLevel()==1)
jtree.expandPath(new TreePath(currentNode.getPath()));
currentNode = currentNode.getNextNode();
}
while (currentNode != null);
// jtree.setExpandsSelectedPaths(false);
jtree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
scrollPane = new JScrollPane(this.getJtree());
add(scrollPane, BorderLayout.WEST);
getJtree().setCellRenderer(new MyTreeCellRenderer());
SwingUtilities.updateComponentTreeUI(this.getJtree());
// scrollPane.repaint();
// this.getJtree().repaint();
// this.repaint();
// this.revalidate();
// this.validate();
}
public void initialiseToolBar() {
setToolBar(new ViewToolBar());
add(getToolBar(), BorderLayout.NORTH);
}
public void initialiseMenuBar() {
this.setOurMenuBar(new ViewOurMenuBar(this.getPathMetaschema()));
this.setJMenuBar(this.getOurMenuBar());
}
public void initialiseGornjaTable() {
// System.out.println("Inicijalizacija tabele");
this.setGornjaTable(new ViewTable(modelEntity));
// System.out.println(modelEntity.getName());
tblStudenti = new JTable(this.gornjaTable.getData(), this.getGornjaTable().getColumns());
tblStudenti02 = new JTable(this.gornjaTable.getData(), this.getGornjaTable().getColumns());
}
public void initialiseLookAndFeel() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception e) {
e.printStackTrace();
}
}
public JTabbedPane getTabbedPane()
{
return tabbedPane;
}
public void setTabbedPane(JTabbedPane tabbedPane)
{
this.tabbedPane = tabbedPane;
}
public ModelStorage getModelStorage() {
return modelStorage;
}
public void setModelStorage(ModelStorage modelStorage) {
this.modelStorage = modelStorage;
}
public NodeStorage getNodeStorage() {
return nodeStorage;
}
public void setNodeStorage(NodeStorage nodeStorage) {
this.nodeStorage = nodeStorage;
}
public ViewToolBar getToolBar() {
return toolBar;
}
public void setToolBar(ViewToolBar toolBar) {
this.toolBar = toolBar;
}
public ViewOurMenuBar getOurMenuBar() {
return ourMenuBar;
}
public void setOurMenuBar(ViewOurMenuBar ourMenuBar) {
this.ourMenuBar = ourMenuBar;
}
public ViewTree getViewTree() {
return viewTree;
}
public void setViewTree(ViewTree viewTree) {
this.viewTree = viewTree;
}
public ViewTable getGornjaTable() {
return gornjaTable;
}
public void setGornjaTable(ViewTable gornjaTable) {
this.gornjaTable = gornjaTable;
}
public ViewTable getDonjaTable() {
return donjaTable;
}
public void setDonjaTable(ViewTable donjaTable) {
this.donjaTable = donjaTable;
}
public JPanel getPanelUp() {
return panelUp;
}
public void setPanelUp(JPanel panelUp) {
this.panelUp = panelUp;
}
public ViewToolBar getTableUpToolBar() {
return tableUpToolBar;
}
public void setTableUpToolBar(ViewToolBar tableUpToolBar) {
this.tableUpToolBar = tableUpToolBar;
}
public JPanel getPanelDown() {
return panelDown;
}
public void setPanelDown(JPanel panelDown) {
this.panelDown = panelDown;
}
/*
@Override
public void valueChanged(TreeSelectionEvent event) {
// TODO Auto-generated method stub
TreePath path = event.getPath();
for(int i = 0; i < path.getPathCount(); i++) {
if(path.getPathComponent(i) instanceof NodeEntity) {
this.setNe((NodeEntity)path.getPathComponent(i));
this.setModelEntity(this.getNe().getModelEntity());
System.out.println("Selektovan dijagram:"+getNe());
System.out.println("getPath: "+event.getPath());
initialiseGornjaTable();
// System.out.println("Initialise gornja tabela");
boolean jeri = false;
for(int br = 0 ; br < tabbedPane.getTabCount(); br++) {
//System.out.println("U FORU " + br);
//System.out.println(tabbedPane.getTitleAt(br));
if(tabbedPane.getTitleAt(br).equals(modelEntity.getName())) {
jeri = true;
}
}
if(!jeri) {
scrollTb1 = new JScrollPane(getTblStudenti());
tabbedPane.addTab(modelEntity.getName(), scrollTb1);
}
break;
}
}
//scrollTb2.add(tblStudenti02);
splitTables.setOrientation(JSplitPane.VERTICAL_SPLIT);
splitTables.setLeftComponent(tabbedPane);
splitTables.setRightComponent(tblStudenti02);
splitTables.setDividerLocation(300);
//split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, scrollPane, split2);
split.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
split.setLeftComponent(scrollPane);
split.setRightComponent(splitTables);
this.add(split, BorderLayout.CENTER);
this.revalidate();
*/
public JTable getTblStudenti02()
{
return tblStudenti02;
}
public void setTblStudenti02(JTable tblStudenti02)
{
this.tblStudenti02 = tblStudenti02;
}
public JSplitPane getSplitTables()
{
return splitTables;
}
public void setSplitTables(JSplitPane splitTables)
{
this.splitTables = splitTables;
}
public void setSplit(JSplitPane split)
{
this.split = split;
}
public NodeEntity getNe() {
return ne;
}
public void setNe(NodeEntity ne) {
this.ne = ne;
}
public ModelEntity getModelEntity() {
return modelEntity;
}
public void setModelEntity(ModelEntity modelEntity) {
this.modelEntity = modelEntity;
}
public JTable getTblStudenti() {
return tblStudenti;
}
public void setTblStudenti(JTable tblStudenti) {
this.tblStudenti = tblStudenti;
}
public JScrollPane getScrollTb2()
{
return scrollTb2;
}
public void setScrollTb2(JScrollPane scrollTb2)
{
this.scrollTb2 = scrollTb2;
}
public JScrollPane getScrollPane()
{
return scrollPane;
}
public void setScrollPane(JScrollPane scrollPane)
{
this.scrollPane = scrollPane;
}
public String getPathMetaschema()
{
return pathMetaschema;
}
public void setPathMetaschema(String pathMetaschema)
{
this.pathMetaschema = pathMetaschema;
}
public JTree getJtree() {
return jtree;
}
public void setJtree(JTree jtree) {
this.jtree = jtree;
}
}
我希望有人会对此有所回答。 我真的不喜欢做GUI，尤其不是Swing， 我是一个后端人。
谢谢你们！ ：）
答案 0 :(得分：0)
setJtree(new JTree(this.getViewTree()));
不要创建新的JTree。创建JTree不会将组件添加到框架中。
相反，您希望用新的TreeModel替换现有JTree的TreeModel：
tree.setModel( ... );
我认为没有必要使用setJTree(...)方法，因为变量引用永远不会改变，只有添加到树中的模型会发生变化。